Drop Ruby 1️⃣.9️⃣ support

Author: amatsuda

.travis.yml

@@ -1,7 +1,6 @@
 language: ruby
 
 rvm:
-  - 1.9.3
   - 2.0.0
   - 2.1
   - 2.2.4

lib/html5_validators.rb

@@ -23,11 +23,7 @@ class Railtie < ::Rails::Railtie #:nodoc:
       end
       ActiveSupport.on_load(:action_view) do
         if ActionPack::VERSION::STRING >= '4'
-          if RUBY_VERSION > '2'
-            require 'html5_validators/action_view/form_helpers'
-          else
-            require 'html5_validators/action_view/form_helpers_ruby1'
-          end
+          require 'html5_validators/action_view/form_helpers'
         else
           require 'html5_validators/action_view/form_helpers_rails3'
         end