Add undocumented argument matchers to README
Add undocumented argument matchers to README

Add hash_including and array_including to README
Discovered via http://stackoverflow.com/a/25011672/1520364
ducthanh/rspec-mocks,telekomatrix/rspec-mocks,telekomatrix/rspec-mocks,AEgan/rspec-mocks,maclover7/rspec-mocks,zephyr-dev/rspec-mocks,rwz/rspec-mocks,edwardpark/rspec-mocks,zephyr-dev/rspec-mocks,rspec/rspec-mocks,ducthanh/rspec-mocks,edwardpark/rspec-mocks,maclover7/rspec-mocks,rwz/rspec-mocks,rspec/rspec-mocks,AEgan/rspec-mocks,h4ck3rm1k3/rspec-mocks,h4ck3rm1k3/rspec-mocks