Added Git Cop support.

- Ensures Git commits are consistent.
- [Details](https://github.com/bkuhlmann/git-cop).

.ruby-version

@@ -0,0 +1 @@
+2.4.1

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake", "~> 12.0"
+gem "git-cop", "~> 1.0"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    git-cop (1.0.0)
+      refinements (~> 4.1)
+      runcom (~> 1.1)
+      thor (~> 0.19)
+      thor_plus (~> 5.1)
+    rake (12.0.0)
+    refinements (4.1.0)
+    runcom (1.1.0)
+      refinements (~> 4.1)
+    thor (0.19.4)
+    thor_plus (5.1.0)
+      thor (~> 0.19)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  git-cop (~> 1.0)
+  rake (~> 12.0)
+
+BUNDLED WITH
+   1.15.1

README.md

@@ -1,5 +1,6 @@
 # macOS
 
+[![Circle CI Status](https://circleci.com/gh/bkuhlmann/mac_os.svg?style=svg)](https://circleci.com/gh/bkuhlmann/mac_os)
 [![Patreon](https://img.shields.io/badge/patreon-donate-brightgreen.svg)](https://www.patreon.com/bkuhlmann)
 
 Shell scripts for automated macOS machine setup.

Rakefile

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+# frozen_string_literal: true
+
+begin
+  require "git/cop/rake/setup"
+rescue LoadError => error
+  puts error.message
+end
+
+task default: :git_cop

circle.yml

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+dependencies:
+  pre:
+    - gem update --system
+    - gem update bundler
+test:
+  override:
+    - bundle exec rake