Version Bump v4.01: Added Troubleshooting section

README.md

@@ -157,6 +157,10 @@ We encourage contribution to our libraries (you might even score some nifty swag
 - [Sign the CLA to Create a Pull Request](https://github.com/sendgrid/sendgrid-ruby/tree/master/CONTRIBUTING.md#cla)
 - [Improvements to the Codebase](https://github.com/sendgrid/sendgrid-ruby/tree/master/CONTRIBUTING.md#improvements_to_the_codebase)
 
+# Troubleshooting
+
+Please see our [troubleshooting guide](https://github.com/sendgrid/sendgrid-ruby/blob/master/TROUBLESHOOTING.md) for common library issues.
+
 # About
 
 sendgrid-ruby is guided and supported by the SendGrid [Developer Experience Team](mailto:[email protected]).

TROUBLESHOOTING.md

@@ -0,0 +1,111 @@
+If you have a non-library SendGrid issue, please contact our [support team](https://support.sendgrid.com).
+
+If you can't find a solution below, please open an [issue](https://github.com/sendgrid/sendgrid-ruby/issues).
+
+
+## Table of Contents
+
+* [Migrating from v2 to v3](#migrating)
+* [Continue Using v2](#v2)
+* [Testing v3 /mail/send Calls Directly](#testing)
+* [Error Messages](#error)
+* [Versions](#versions)
+* [Environment Variables and Your SendGrid API Key](#environment)
+* [Using the Package Manager](#package-manager)
+
+<a name="migrating"></a>
+## Migrating from v2 to v3
+
+Please review [our guide](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/how_to_migrate_from_v2_to_v3_mail_send.html) on how to migrate from v2 to v3.
+
+<a name="v2"></a>
+## Continue Using v2
+
+[Here](https://github.com/sendgrid/sendgrid-ruby/tree/0fbf579c0f7ed1dff87adc4957c4dc5a6b257068) is the last working version with v2 support.
+
+Using rubygems:
+
+Add this line to your application's Gemfile:
+
+```bash
+gem 'sendgrid-ruby',  '1.1.6'
+```
+
+And then execute:
+
+```bash
+bundle
+```
+
+Or install it yourself using:
+
+```bash
+gem install sendgrid-ruby -v 1.1.6
+```
+
+Download:
+
+Click the "Clone or download" green button in [GitHub](https://github.com/sendgrid/sendgrid-ruby/tree/0fbf579c0f7ed1dff87adc4957c4dc5a6b257068) and choose download.
+
+<a name="testing"></a>
+## Testing v3 /mail/send Calls Directly
+
+[Here](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/curl_examples.html) are some cURL examples for common use cases.
+
+<a name="error"></a>
+## Error Messages
+
+To read the error message returned by SendGrid's API:
+
+```ruby
+begin
+    response = sg.client.mail._("send").post(request_body: mail.to_json)
+rescue Exception => e
+    puts e.message
+end
+```
+
+<a name="versions"></a>
+## Versions
+
+We follow the MAJOR.MINOR.PATCH versioning scheme as described by [SemVer.org](http://semver.org). Therefore, we recommend that you always pin (or vendor) the particular version you are working with to your code and never auto-update to the latest version. Especially when there is a MAJOR point release, since that is guarenteed to be a breaking change. Changes are documented in the [CHANGELOG](https://github.com/sendgrid/sendgrid-ruby/blob/master/CHANGELOG.md) and [releases](https://github.com/sendgrid/sendgrid-ruby/releases) section.
+
+<a name="environment"></a>
+## Environment Variables and Your SendGrid API Key
+
+All of our examples assume you are using [environment variables](https://github.com/sendgrid/sendgrid-ruby#setup-environment-variables) to hold your SendGrid API key.
+
+If you choose to add your SendGrid API key directly (not recommended):
+
+`sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])`
+
+becomes
+
+`sg = SendGrid::API.new(api_key: 'SENDGRID_API_KEY')`
+
+In the first case SENDGRID_API_KEY is in reference to the name of the environment variable, while the second case references the actual SendGrid API Key.
+
+<a name="package-manager"></a>
+## Using the Package Manager
+
+We upload this library to [RubyGems](https://rubygems.org/gems/sendgrid-ruby) whenever we make a release. This allows you to use [RubyGems](https://rubygems.org) for easy installation.
+
+In most cases we recommend you download the latest version of the library, but if you need a different version, please use:
+
+Add this line to your application's Gemfile:
+
+```bash
+gem 'sendgrid-ruby',  'X.X.X'
+```
+
+And then execute:
+
+```bash
+bundle
+```
+
+Or install it yourself using:
+
+```bash
+gem install sendgrid-ruby -v X.X.X
+```