bump version to 2.2

lib/rspec/rails/version.rb

@@ -1,7 +1,7 @@
 module RSpec # :nodoc:
   module Rails # :nodoc:
     module Version # :nodoc:
-      STRING = '2.2.pre'
+      STRING = '2.2.0'
     end
   end
 end

rspec-rails.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.files            = `git ls-files`.split("\n")
   s.test_files       = `git ls-files -- {spec,features}/*`.split("\n")
   s.executables      = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
-  s.extra_rdoc_files = [ "README.markdown" ]
+  s.extra_rdoc_files = [ "README.md" ]
   s.rdoc_options     = ["--charset=UTF-8"]
   s.require_path     = "lib"