Fix Rubocop and add additional rubocop plugins

[codecov[bot]]

Codecov Report

Base: 87.14% // Head: 87.14% // No change to project coverage :thumbsup:

Coverage data is based on head (0c05870) compared to base (ac051ca). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #255 +/- ## ======================================= Coverage 87.14% 87.14% ======================================= Files 30 30 Lines 1019 1019 ======================================= Hits 888 888 Misses 131 131 ``` | [Impacted Files](https://codecov.io/gh/voxpupuli/modulesync/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli) | Coverage Δ | | |---|---|---| | [lib/modulesync.rb](https://codecov.io/gh/voxpupuli/modulesync/pull/255/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli#diff-bGliL21vZHVsZXN5bmMucmI=) | `98.57% <100.00%> (ø)` | | | [lib/modulesync/git\_service/base.rb](https://codecov.io/gh/voxpupuli/modulesync/pull/255/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli#diff-bGliL21vZHVsZXN5bmMvZ2l0X3NlcnZpY2UvYmFzZS5yYg==) | `90.47% <100.00%> (ø)` | | | [lib/modulesync/hook.rb](https://codecov.io/gh/voxpupuli/modulesync/pull/255/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli#diff-bGliL21vZHVsZXN5bmMvaG9vay5yYg==) | `100.00% <100.00%> (ø)` | | | [lib/modulesync/renderer.rb](https://codecov.io/gh/voxpupuli/modulesync/pull/255/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli#diff-bGliL21vZHVsZXN5bmMvcmVuZGVyZXIucmI=) | `96.29% <100.00%> (ø)` | | | [lib/modulesync/repository.rb](https://codecov.io/gh/voxpupuli/modulesync/pull/255/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli#diff-bGliL21vZHVsZXN5bmMvcmVwb3NpdG9yeS5yYg==) | `94.44% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=voxpupuli)

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