Merge pull request #2361 from VSPPedro/update-readme

Reflect latest version (4.0.1) in README

Author: JonRowe

README.md

@@ -30,7 +30,7 @@ Use **[`rspec-rails` 1.x][]** for Rails 2.x.
    ```ruby
    # Run against the latest stable release
    group :development, :test do
-     gem 'rspec-rails', '~> 4.0.0'
+     gem 'rspec-rails', '~> 4.0.1'
    end
 
    # Or, run against the master branch