Cannot build via binary or docker with go 1.14

[appleciderjack]

Hi, nice work on the project!

I am looking to add tls flags as a branch, but I am coming up short when trying to build the binary.

go run mage.go binary
../../../.go/src/github.com/mholt/archiver/lz4.go:8:2: cannot find package "github.com/pierrec/lz4/v3" in any of:
        /usr/local/opt/go/libexec/src/github.com/pierrec/lz4/v3 (from $GOROOT)
        /Users/jack/.go/src/github.com/pierrec/lz4/v3 (from $GOPATH)
Error: error compiling magefiles
exit status 1

Checking in with the lz4 project page, and they suggested to add this flag:

GO111MODULE=on go get github.com/pierrec/lz4/v3
go: downloading github.com/pierrec/lz4 v1.0.1
go: downloading github.com/pierrec/lz4/v3 v3.3.2
go: downloading github.com/pierrec/lz4 v2.5.2+incompatible
go: github.com/pierrec/lz4/v3 upgrade => v3.3.2

But for mage, it seems that that alone is not enough to fix it.

jack@Jacks-MacBook-Pro-2 postgres_exporter % GO111MODULE=on go run mage.go binary
mage.go:8:2: cannot find module providing package github.com/magefile/mage/mage: working directory is not part of a module
jack@Jacks-MacBook-Pro-2 postgres_exporter % go get -u -v github.com/magefile/mage@68374889480d95d7e4b6626a1843e7cb559ac3e4
go: cannot use path@version syntax in GOPATH mode
jack@Jacks-MacBook-Pro-2 postgres_exporter % go run mage.go docker
../../../.go/src/github.com/mholt/archiver/lz4.go:8:2: cannot find package "github.com/pierrec/lz4/v3" in any of:
        /usr/local/opt/go/libexec/src/github.com/pierrec/lz4/v3 (from $GOROOT)
        /Users/jack/.go/src/github.com/pierrec/lz4/v3 (from $GOPATH)
Error: error compiling magefiles
exit status 1

Any idea on how to proceed?
My current backup plan to is to do tls termination either via Nginx (if already present) or telegraf (with prometheus input and prometheus output plugins).

Thank you