Update dependencies

[jazairi]

Note that this excludes sqlite3, which Rails does not yet support (but probably will in the next release). See MITLibraries/tacos#42 for details.

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New ENV

• All new ENV is documented in README.
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Code Reviewer

Code

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  added technical debt.

Documentation

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  (not just this pull request message).
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[coveralls]

Pull Request Test Coverage Report for Build 9714826650

Details

• 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 98.653%

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Totals
Change from base Build 9648228472:	0.0%
Covered Lines:	586
Relevant Lines:	594

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💛 - Coveralls