remove conditional enhancer that was never released

Author: dbu

CHANGELOG.md

@@ -5,9 +5,7 @@ Changelog
 ---------
 
  * **2016-11-30**: Changed file structure to have all php code in src/
- * **2016-05-11**: Added a ConditionalEnhancer that accepts pairs of request matcher
-   and enhancer to be called if the request matcher matches the request.
-
+ 
 1.4.0
 -----