Flake8-typing-collections

What's Changed
* Fix crash upon relative imports without module name by mhthies in https://github.com/atollk/flake8-typing-collections/pull/3
* v2.1 by atollk in https://github.com/atollk/flake8-typing-collections/pull/4

New Contributors
* mhthies made their first contribution in https://github.com/atollk/flake8-typing-collections/pull/3

**Full Changelog**: https://github.com/atollk/flake8-typing-collections/compare/v2.0...v2.1

Changed all error codes to be compatible with flake8 now enforcing a strict three letter-three digit pattern.

Two bug fixes mostly related to subscripted types.

First release.