rubocop require ruby >= 2.0

Author: toy

.appveyor.yml

@@ -85,6 +85,7 @@ test_script:
         echo "################################################################################"
         $env:Path = "$rubypath;" + $path
         ruby --version
+        bundle package --all
         bundle install --local -j4
         bundle exec rspec
         if ($LASTEXITCODE -gt 0) {

.travis.yml

@@ -49,7 +49,7 @@ matrix:
     - env: RAILS_VERSION='~> 4.0' CODECLIMATE=1
       rvm: '2'
     - env: RUBOCOP=true
-      rvm: default
+      rvm: '2'
   allow_failures:
     - rvm: jruby-19mode
 addons:

image_optim.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'image_optim_pack', '~> 0.2', '>= 0.2.2'
   s.add_development_dependency 'rspec', '~> 3.0'
-  if RUBY_VERSION >= '1.9.3'
+  if RUBY_VERSION >= '2.0'
     s.add_development_dependency 'rubocop', '~> 0.37'
   end
 end