README.md in gnawrnip-0.4.0 vs README.md in gnawrnip-0.5.0

@@ -14,11 +14,10 @@
 
 
 ## Requirements
 
 * Ruby
-    * `~> 1.9.3`
-    * `~> 2.0.0`
+    * `2.1.0` or higher
 * RubyGems
     * capybara `~> 2.1.0`
     * turnip_formatter
 
 ## Installation