andela / thor-ah / 399

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feat(comment): track comment edit history functionality

Allow users update, their comments, and also track the edit history
of each update.
- add updateComment method
- prevent users from updating other users' comments
- add relevant tests
- use hooks to update commentHistory model
- return updated comment with each update

303 of 360 branches covered (84.17%)

Branch coverage included in aggregate %.

1731 of 1826 relevant lines covered (94.8%)

3.01 hits per line