[changelog] updated s2i-openresty

* new rover integration 3scale/s2i-openresty#38
* builder and runtime images have the same path `/opt/app-root/src`
* apicast can start without a prefix, using default openresty prefix

Author: mikz

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Increased number of background timers and connections in the cosocket pool [PR #290](https://github.com/3scale/apicast/pull/290)
 - Make OAuth tokens TTL configurable [PR #448](https://github.com/3scale/apicast/pull/448)
 - Detect when being executed in Test::Nginx and use default backend accordingly [PR #458](https://github.com/3scale/apicast/pull/458)
+- Update the s2i-openresty image to have the same path (`/opt/app-root/src`) in all images [PR #460](https://github.com/3scale/apicast/pull/460)
 
 ### Fixed