Gravitybee

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* [DEPRECATION] Deprecates Python 3.6 support.

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* [FEATURE] Add option --hook-template that allows user to specify their own hook
template for PyInstaller.
* [FIX] Update the included hook-template to work correctly when the pkg_name and
app_name are different.

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* [ENHANCEMENT] Remove pipenv files and update setup.cfg dependency versions.

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* [ENHANCEMENT] Bump version to include updated dependencies.

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* [ENHANCEMENT] Bump version to include updated dependencies.

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* [ENHANCEMENT] Fix distutils issue, improve error handling, update versions.