Update README.md

You should append .finish method to new Rack::Response object.
We want to use a delimiter agnostic path generator
Merge pull request #576 from mateuszkosmider/master

Update README.md
Merge pull request #577 from krainboltgreene/patch-1

We want to use a delimiter agnostic path generator
fix OPTIONS regression. fixes #573
remove offending line
README: more consistent delimiter agnostic paths
Merge pull request #582 from stevschmid/573-fix

Fix OPTIONS regression
Merge pull request #584 from goldcaddy77/readme-agnostic-paths

README: more consistent delimiter agnostic paths
Fix after boot thread-safety issue
Merge pull request #585 from SPBTV/thread-safety

Fix after boot thread-safety issue