Bump rubocop dependency to 0.80.0

[funzoneq]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

➜  oxidized git:(master) rubocop --auto-correct
/Users/avermeer/Documents/oxidized/.rubocop.yml: Warning: no department given for StringLiterals.
/Users/avermeer/Documents/oxidized/.rubocop.yml: Warning: no department given for LineLength.
Error: The `Layout/AlignHash` cop has been renamed to `Layout/HashAlignment`.
(obsolete configuration found in .rubocop.yml, please update it)
➜  oxidized git:(fix/rubocop) rubocop -v
0.79.0

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@e028589). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2029   +/-   ##
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  Coverage          ?   63.32%           
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  Files             ?       30           
  Lines             ?     1497           
  Branches          ?        0           
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  Hits              ?      948           
  Misses            ?      549           
  Partials          ?        0

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[wk]

The required version of Rubocop for oxidized is currently at ~> 0.74.0, and the error you are seeing is the result of using a newer version of Rubocop which contains incompatible changes.

I have expanded on your changes to complete the transition from 0.74.0 to 0.80.0.