Make 2.1.1 release

[kghbln]

This PR is made in reference to: #82

This PR addresses or contains:

• Provides release information
• Increments version

This PR includes:

• [ ] Tests (unit/integration)
• [ ] CI build passed

Fixes #

[kghbln]

@mwjames Failures unrelated to the code as such. I suspect changed PHPUNIT coding requirements are to blame