Lint Ruby files. More information: <https://docs.rubocop.org/rubocop/usage/basic_usage.html>.

• Check all files in the current directory (including subdirectories):
  rubocop
• Check one or more specific files or directories:
  rubocop path/to/file path/to/directory
• Write output to file:
  rubocop --out path/to/file
• View list of cops (linter rules):
  rubocop --show-cops
• Exclude a cop:
  rubocop --except cop_1 cop_2
• Run only specified cops:
  rubocop --only cop_1 cop_2
• Auto-correct files (experimental):
  rubocop --auto-correct

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