Various fixes.

[dotpot]

Description

• Added: py 38,39 into the tox.
• Added: deprecation warning on bundle_id for appstore validator.
• Remoted: install_requires version for oauth2client.
• Changed: regenerated requirements.txt.
• Changed: Pipfile moved things around.
• Changed: added more fixtures, changed tests accordingly.

Related Issue

Closes #69

How Has This Been Tested?

tox

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the code style of this project.
• [x] All new and existing tests passed.