Gemfile in rantly-2.0.0 vs Gemfile in rantly-3.0.0

@@ -1,10 +1,11 @@
 source 'https://rubygems.org'
 
 group :development, :test do
   gem 'coveralls', '>= 0', require: false
   gem 'minitest',  '~> 5.10.0'
-  gem 'rake',      '~> 12.0.0'
+  gem 'rake',      '~> 12.3.3'
   gem 'simplecov', '>= 0'
 
   gem 'rubocop'
+  gem 'rubocop-performance', require: false
 end