Revert Go module support

Reverts:
#712

(And an earlier PR that added a `go.mod` file in the first place.)

Unfortunately, there are still some fairly bad incompatibilities between
Go modules and Dep for users still on the latter. For now, we're going
to revert Go module support because there doesn't seem to be any easy
way (i.e., anything that's not maintaining a fork) of doing a good job
of both. Projects can still use the Go module system, but will have to
pull this package in as a pre-module incompatible one.

We are hoping to eventually see basic module awareness merged into Dep:

golang/dep#1963

If/when that gets done, we'll revert this revert after a small grace
period, and hopefully be back to a place where both packaging systems
are well supported.

I'll also modify the README to clarify the current situation in another
follow up PR.

.travis.yml

@@ -33,9 +33,9 @@ env:
     - STRIPE_MOCK_VERSION=0.40.0
 
 go:
-  - "1.9.x"
-  - "1.10.x"
-  - "1.11.x"
+  - "1.9"
+  - "1.10"
+  - "1.11"
   - tip
 
 language: go

account.go

@@ -3,7 +3,7 @@ package stripe
 import (
 	"encoding/json"
 
-	"github.com/stripe/stripe-go/v55/form"
+	"github.com/stripe/stripe-go/form"
 )
 
 // AccountType is the type of an account.

account/client.go

@@ -6,8 +6,8 @@ package account
 import (
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke APIs related to accounts.

account/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestAccountDel(t *testing.T) {

account_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	"github.com/stripe/stripe-go/v55/form"
+	"github.com/stripe/stripe-go/form"
 )
 
 func TestAccountExternalAccountParams_AppendTo(t *testing.T) {

accountlink/client.go

@@ -6,7 +6,7 @@ package accountlink
 import (
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
+	stripe "github.com/stripe/stripe-go"
 )
 
 // Client is used to invoke APIs related to account links.

accountlink/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestAccountLinkNew(t *testing.T) {

applepaydomain/client.go

@@ -4,8 +4,8 @@ package applepaydomain
 import (
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke /apple_pay/domains and Apple Pay domain-related APIs.

applepaydomain/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestApplePayDomainDel(t *testing.T) {

balance/client.go

@@ -4,8 +4,8 @@ package balance
 import (
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke /balance and transaction-related APIs.

balance/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestBalanceGet(t *testing.T) {

bankaccount.go

@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"strconv"
 
-	"github.com/stripe/stripe-go/v55/form"
+	"github.com/stripe/stripe-go/form"
 )
 
 // BankAccountStatus is the list of allowed values for the bank account's status.

bankaccount/client.go

@@ -5,8 +5,8 @@ import (
 	"errors"
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke /bank_accounts APIs.

bankaccount/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestBankAccountDel_ByAccount(t *testing.T) {

bankaccount_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	"github.com/stripe/stripe-go/v55/form"
+	"github.com/stripe/stripe-go/form"
 )
 
 func TestBankAccount_UnmarshalJSON(t *testing.T) {

bitcoinreceiver/client.go

@@ -7,8 +7,8 @@ package bitcoinreceiver
 import (
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke /bitcoin/receivers APIs.

bitcoinreceiver/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestBitcoinReceiverGet(t *testing.T) {

bitcointransaction/client.go

@@ -4,8 +4,8 @@ package bitcointransaction
 import (
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke /bitcoin/receivers/:receiver_id/transactions APIs.

bitcointransaction/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestBitcoinTransactionList(t *testing.T) {

card.go

@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"strconv"
 
-	"github.com/stripe/stripe-go/v55/form"
+	"github.com/stripe/stripe-go/form"
 )
 
 // CardAvailablePayoutMethod is a set of available payout methods for the card.

card/client.go

@@ -5,8 +5,8 @@ import (
 	"errors"
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke /cards APIs.

card/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestCardDel(t *testing.T) {

card_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	"github.com/stripe/stripe-go/v55/form"
+	"github.com/stripe/stripe-go/form"
 )
 
 func TestCardListParams_AppendTo(t *testing.T) {

charge/client.go

@@ -6,8 +6,8 @@ package charge
 import (
 	"net/http"
 
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/form"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/form"
 )
 
 // Client is used to invoke APIs related to charges.

charge/client_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	stripe "github.com/stripe/stripe-go/v55"
-	_ "github.com/stripe/stripe-go/v55/testing"
+	stripe "github.com/stripe/stripe-go"
+	_ "github.com/stripe/stripe-go/testing"
 )
 
 func TestChargeCapture(t *testing.T) {

charge_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 
 	assert "github.com/stretchr/testify/require"
-	"github.com/stripe/stripe-go/v55/form"
+	"github.com/stripe/stripe-go/form"
 )
 
 func TestCharge_UnmarshalJSON(t *testing.T) {

client/api.go

@@ -2,64 +2,64 @@
 package client
 
 import (
-	stripe "github.com/stripe/stripe-go/v55"
-	"github.com/stripe/stripe-go/v55/account"
-	"github.com/stripe/stripe-go/v55/applepaydomain"
-	"github.com/stripe/stripe-go/v55/balance"
-	"github.com/stripe/stripe-go/v55/bankaccount"
-	"github.com/stripe/stripe-go/v55/bitcoinreceiver"
-	"github.com/stripe/stripe-go/v55/bitcointransaction"
-	"github.com/stripe/stripe-go/v55/card"
-	"github.com/stripe/stripe-go/v55/charge"
-	"github.com/stripe/stripe-go/v55/countryspec"
-	"github.com/stripe/stripe-go/v55/coupon"
-	"github.com/stripe/stripe-go/v55/customer"
-	"github.com/stripe/stripe-go/v55/discount"
-	"github.com/stripe/stripe-go/v55/dispute"
-	"github.com/stripe/stripe-go/v55/ephemeralkey"
-	"github.com/stripe/stripe-go/v55/event"
-	"github.com/stripe/stripe-go/v55/exchangerate"
-	"github.com/stripe/stripe-go/v55/fee"
-	"github.com/stripe/stripe-go/v55/feerefund"
-	"github.com/stripe/stripe-go/v55/file"
-	"github.com/stripe/stripe-go/v55/filelink"
-	"github.com/stripe/stripe-go/v55/invoice"
-	"github.com/stripe/stripe-go/v55/invoiceitem"
-	"github.com/stripe/stripe-go/v55/issuerfraudrecord"
-	"github.com/stripe/stripe-go/v55/issuing/authorization"
-	issuingcard "github.com/stripe/stripe-go/v55/issuing/card"
-	"github.com/stripe/stripe-go/v55/issuing/cardholder"
-	issuingdispute "github.com/stripe/stripe-go/v55/issuing/dispute"
-	"github.com/stripe/stripe-go/v55/issuing/transaction"
-	"github.com/stripe/stripe-go/v55/loginlink"
-	"github.com/stripe/stripe-go/v55/order"
-	"github.com/stripe/stripe-go/v55/orderreturn"
-	"github.com/stripe/stripe-go/v55/paymentintent"
-	"github.com/stripe/stripe-go/v55/paymentsource"
-	"github.com/stripe/stripe-go/v55/payout"
-	"github.com/stripe/stripe-go/v55/plan"
-	"github.com/stripe/stripe-go/v55/product"
-	"github.com/stripe/stripe-go/v55/radar/valuelist"
-	"github.com/stripe/stripe-go/v55/radar/valuelistitem"
-	"github.com/stripe/stripe-go/v55/recipient"
-	"github.com/stripe/stripe-go/v55/refund"
-	"github.com/stripe/stripe-go/v55/reporting/reportrun"
-	"github.com/stripe/stripe-go/v55/reporting/reporttype"
-	"github.com/stripe/stripe-go/v55/reversal"
-	"github.com/stripe/stripe-go/v55/sigma/scheduledqueryrun"
-	"github.com/stripe/stripe-go/v55/sku"
-	"github.com/stripe/stripe-go/v55/source"
-	"github.com/stripe/stripe-go/v55/sourcetransaction"
-	"github.com/stripe/stripe-go/v55/sub"
-	"github.com/stripe/stripe-go/v55/subitem"
-	terminalconnectiontoken "github.com/stripe/stripe-go/v55/terminal/connectiontoken"
-	terminallocation "github.com/stripe/stripe-go/v55/terminal/location"
-	terminalreader "github.com/stripe/stripe-go/v55/terminal/reader"
-	"github.com/stripe/stripe-go/v55/token"
-	"github.com/stripe/stripe-go/v55/topup"
-	"github.com/stripe/stripe-go/v55/transfer"
-	"github.com/stripe/stripe-go/v55/usagerecord"
-	"github.com/stripe/stripe-go/v55/webhookendpoint"
+	stripe "github.com/stripe/stripe-go"
+	"github.com/stripe/stripe-go/account"
+	"github.com/stripe/stripe-go/applepaydomain"
+	"github.com/stripe/stripe-go/balance"
+	"github.com/stripe/stripe-go/bankaccount"
+	"github.com/stripe/stripe-go/bitcoinreceiver"
+	"github.com/stripe/stripe-go/bitcointransaction"
+	"github.com/stripe/stripe-go/card"
+	"github.com/stripe/stripe-go/charge"
+	"github.com/stripe/stripe-go/countryspec"
+	"github.com/stripe/stripe-go/coupon"
+	"github.com/stripe/stripe-go/customer"
+	"github.com/stripe/stripe-go/discount"
+	"github.com/stripe/stripe-go/dispute"
+	"github.com/stripe/stripe-go/ephemeralkey"
+	"github.com/stripe/stripe-go/event"
+	"github.com/stripe/stripe-go/exchangerate"
+	"github.com/stripe/stripe-go/fee"
+	"github.com/stripe/stripe-go/feerefund"
+	"github.com/stripe/stripe-go/file"
+	"github.com/stripe/stripe-go/filelink"
+	"github.com/stripe/stripe-go/invoice"
+	"github.com/stripe/stripe-go/invoiceitem"
+	"github.com/stripe/stripe-go/issuerfraudrecord"
+	"github.com/stripe/stripe-go/issuing/authorization"
+	issuingcard "github.com/stripe/stripe-go/issuing/card"
+	"github.com/stripe/stripe-go/issuing/cardholder"
+	issuingdispute "github.com/stripe/stripe-go/issuing/dispute"
+	"github.com/stripe/stripe-go/issuing/transaction"
+	"github.com/stripe/stripe-go/loginlink"
+	"github.com/stripe/stripe-go/order"
+	"github.com/stripe/stripe-go/orderreturn"
+	"github.com/stripe/stripe-go/paymentintent"
+	"github.com/stripe/stripe-go/paymentsource"
+	"github.com/stripe/stripe-go/payout"
+	"github.com/stripe/stripe-go/plan"
+	"github.com/stripe/stripe-go/product"
+	"github.com/stripe/stripe-go/radar/valuelist"
+	"github.com/stripe/stripe-go/radar/valuelistitem"
+	"github.com/stripe/stripe-go/recipient"
+	"github.com/stripe/stripe-go/refund"
+	"github.com/stripe/stripe-go/reporting/reportrun"
+	"github.com/stripe/stripe-go/reporting/reporttype"
+	"github.com/stripe/stripe-go/reversal"
+	"github.com/stripe/stripe-go/sigma/scheduledqueryrun"
+	"github.com/stripe/stripe-go/sku"
+	"github.com/stripe/stripe-go/source"
+	"github.com/stripe/stripe-go/sourcetransaction"
+	"github.com/stripe/stripe-go/sub"
+	"github.com/stripe/stripe-go/subitem"
+	terminalconnectiontoken "github.com/stripe/stripe-go/terminal/connectiontoken"
+	terminallocation "github.com/stripe/stripe-go/terminal/location"
+	terminalreader "github.com/stripe/stripe-go/terminal/reader"
+	"github.com/stripe/stripe-go/token"
+	"github.com/stripe/stripe-go/topup"
+	"github.com/stripe/stripe-go/transfer"
+	"github.com/stripe/stripe-go/usagerecord"
+	"github.com/stripe/stripe-go/webhookendpoint"
 )
 
 // API is the Stripe client. It contains all the different resources available.