Gemfile in hackerone-client-0.15.0 vs Gemfile in hackerone-client-0.16.0

@@ -1,14 +1,22 @@
-source 'https://rubygems.org'
+# frozen_string_literal: true
 
+source "https://rubygems.org"
+
 # Specify your gem's dependencies in hackerone-client.gemspec
 gemspec
 
 group :developement do
   gem "pry"
 end
 
+group :test do
+  gem "rubocop", "< 0.68"
+  gem "rubocop-github"
+  gem "rubocop-performance"
+end
+
 group :guard do
-  gem "growl", :require => RUBY_PLATFORM.include?('darwin') && 'growl'
-  gem "rb-fsevent", :require => RUBY_PLATFORM.include?('darwin') && 'rb-fsevent'
+  gem "growl", require: RUBY_PLATFORM.include?("darwin") && "growl"
   gem "guard-rspec"
+  gem "rb-fsevent", require: RUBY_PLATFORM.include?("darwin") && "rb-fsevent"
 end