Update rubocop requirement from ~> 0.80 to ~> 1.2

Updates the requirements on [rubocop](https://github.com/rubocop-hq/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.80.0...v1.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile

@@ -13,7 +13,7 @@ gem "rspec-mocks"
 gem "rspec-rails", "~> 4.0"
 gem "rspec-support"
 
-gem "rubocop", "~> 0.80"
+gem "rubocop", "~> 1.2"
 gem "rubocop-performance", require: false
 gem "rubocop-rails", require: false
 gem "rubocop-rspec", require: false