Move RSpec & Cucumber sub-sections into Bundler section of README

These sections are not Rails-specific and so I think this order makes
more sense.

README.md

@@ -65,22 +65,6 @@ require "minitest/unit"
 require "mocha/minitest"
 ```
 
-#### Rails
-
-If you're loading Mocha using Bundler within a Rails application, you should setup Mocha manually e.g. at the bottom of your `test_helper.rb`.
-
-##### MiniTest
-
-Note that since Rails v4 (at least), `ActiveSupport::TestCase` has inherited from `Minitest::Test` or its earlier equivalents. Thus unless you are *explicitly* using Test::Unit, you are likely to be using MiniTest.
-
-```ruby
-# Gemfile in Rails app
-gem 'mocha'
-
-# At bottom of test_helper.rb (or at least after `require 'rails/test_help'`)
-require 'mocha/minitest'
-```
-
 ##### RSpec
 
 RSpec includes a mocha adapter. Just tell RSpec you want to mock with `:mocha`:
@@ -116,6 +100,22 @@ Around do |scenario, block|
 end
 ```
 
+#### Rails
+
+If you're loading Mocha using Bundler within a Rails application, you should setup Mocha manually e.g. at the bottom of your `test_helper.rb`.
+
+##### MiniTest
+
+Note that since Rails v4 (at least), `ActiveSupport::TestCase` has inherited from `Minitest::Test` or its earlier equivalents. Thus unless you are *explicitly* using Test::Unit, you are likely to be using MiniTest.
+
+```ruby
+# Gemfile in Rails app
+gem 'mocha'
+
+# At bottom of test_helper.rb (or at least after `require 'rails/test_help'`)
+require 'mocha/minitest'
+```
+
 #### Known Issues
 
 * In Mocha v1.10.0 an undocumented feature of `API#mock`, `API#stub` & `API#stub_everything` was changed. Previously when these methods were passed a single symbol, they returned a mock object that responded to the method identified by the symbol. Now Passing a single symbol is equivalent to passing a single string, i.e. it now defines the "name" of the mock object.