Refactored package to be compatible with Poetry and Pipenv

• Fixed MANIFEST.in file.
• Fixed github actions to support Python 3.6 for testing.
• Bumped Patch version.

Bumped Patch Version to 1.0.3 considering patches involved with the release.

Special thanks to @jonbiemond for making the fixes. 😃

Stable Release for the package

This includes updated documentation and source code.