This introduces full support for Go context.Context objects, following best practices documented by the Go community.

All exported functions which can generate HTTP requests now require a context.Context object as their first parameter; the 'ctx' fields in Input structures (used in previous versions of go-fastly) have been removed. The provided context will be used for all HTTP requests generated by the function.

If the application using go-fastly does not have existing context.Context objects of its own, then context.TODO() can be passed to the go-fastly functions.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

• Does your submission pass tests?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully run tests with your changes locally?

User Impact

• What is the user impact of this change?

This is a major breaking change and will require a version-bump of the module, as well as a forum post and other types of outbound communication.