Update rubocop requirement from 1.32.0 to 1.36.0 (#174)

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.32.0...v1.36.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:production
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -6,7 +6,7 @@ gem "minitest-ci", "~> 3.4"
 gem "minitest-reporters", "~> 1.1"
 gem "mocha", "~> 1.11"
 gem "rake", "~> 13.0"
-gem "rubocop", "1.32.0"
+gem "rubocop", "1.36.0"
 gem "rubocop-minitest", "0.21.1"
 gem "rubocop-packaging", "0.5.1"
 gem "rubocop-performance", "1.14.3"