Dropping the ruby version requirement to all 1.9+

I'm fairly sure I don't need to specify the patch level. We'll see if
I'm wrong

More info can be found here
http://guides.rubygems.org/specification-reference/#required_ruby_version=

Author: zmoazeni

csscss.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
 
-  gem.required_ruby_version = ">= 1.9.2"
+  gem.required_ruby_version = ">= 1.9"
 
   gem.add_dependency "parslet", "~> 1.5"
   gem.add_dependency "colorize"