Fixed link to PR in CHANGELOG

Author: michalbundyra

CHANGELOG.md

@@ -99,7 +99,7 @@ All notable changes to this project will be documented in this file, in reverse
   Security Policy CSP HTTP header when it is `none` (empty value).
 - [#92](https://github.com/zendframework/zend-http/pull/92) fixes the flatten
   cookies value for array value (also multidimensional).
-- [#34](https://github.com/zendframework/zend-http/issues/33) fixes the
+- [#34](https://github.com/zendframework/zend-http/pull/34) fixes the
   standard separator (&) for application/x-www-form-urlencoded.
 
 ## 2.5.5 - 2016-08-08