invalidate cache tags

invalidate cache tags for anonymous users.

This is important because anonymous users also share cached tags and in theory access a response after being logged out for some time.

Working version

This release contains refactors the code slightly. No breaking changes.

Moving to semantic versioning for release.

Virtual Edit Field Link

When working in a de-coupled environment it might be useful to output a Drupal entity's edit link as part of a RESTful implementation (such as when using Drupal's core JSON API that comes preinstalled on Drupal Distro such as contenta).