andela / ah-backend-summer / 383

99%

develop: 98%

Pull #43

travis-ci

feat(tract edit history): Comment edit history

- add model_helpers to retrieve history
- add simple history library
- create api endpoint to retrieve user comments edit history
- writes tests for the functionalities
- add a permissions class to check whether a user trying to get edit
history for a comment or comment reply owns it.
- Resolve pep8 issues

[Starts #163383198]

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