Adding Linting and mypy to pipeline

Made the following improvements:

• added py.typed file
• fixed few pylint errors
• added pylint, mypy, blue, and pylama checks to pipeline

What's Changed

• Typing changes by @tybruno in #10

Full Changelog: v2.0.0...v2.0.1

v2.0.0

What's Changed

• Add caseless attr dict by @tybruno in #9

• Added more caseless dictionaries.
• Added caseless attribute dictionaries.

Full Changelog: v1.0.3...v2.0.0

v1.0.3 Update ModifiableItemsDictionary version

• Updated the ModifiableItemsDictionary requirements
• Modified imports to use import instead of from
• Cleaned up setup.py

v1.0.2 Updating Project Description and Acknowledgements

Updates

• Updated project description in setup.py.
• Gave acknowledgments to Raymond Hettinger @rhettinger

v1.0.1 Update README with Badges

Updates

Added Badges to README.md

v1.0.0 Initial Release

Initial release of CaselessDict, TitleCaselessDict, UpperCaselessDict, and testing.