Update autotest.rb
Update autotest.rb

Running with Ruby 2.2.0, Rails 4.2.0, Rspec-Rails 3.1.0 (rspec-core 3.1.7), produces an `uninitialized constant ActiveSupport::Deprecation` error because the `active_support/deprecation` is not being loaded.

This addresses issue #21
rspec/rspec-autotest,rspec/rspec-autotest