andela / metis-ah / 537

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develop: 91%

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travis-ci

feat(comment history): track comment history

- add CommentHistory and ReplyHistory models
- create relationship between models and parent models (comment and replies)
- add controller for updating comment and replies
- add controller for adding replies
- create endpoint for updating comment and replies
- create middleware for validating comment and reply id
- create middleware for authorizing comment or reply updates
- add test files
- document endpoint

[Delivers #159987424]

202 of 225 branches covered (89.78%)

Branch coverage included in aggregate %.

742 of 798 relevant lines covered (92.98%)

4.16 hits per line