Update six dependency from 1.11.0 to 1.12.0

[cSchubes]

Description of new feature, or changes

Update six dependency from 1.11.0 to 1.12.0 (newest version) to reduce conflicts with popular packages like tensorflow.

Checklist

• [x] Your branch is up-to-date with the base branch
• [x] You've included at least one test if this is a new feature
• [x] All tests are passing

Related Issues and Discussions

Fixes #120

People to notify

@manrajgrover

[coveralls]

Pull Request Test Coverage Report for Build 354

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.231%

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Totals
Change from base Build 350:	0.0%
Covered Lines:	289
Relevant Lines:	313

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💛 - Coveralls

[cSchubes]

glad it worked! I'm also waiting on #107, so if you can include that in the release it would be amazing!

[manrajgrover]

@cSchubes Surely! I hope to merge it as soon as I get reply to my review and release it soon!