Merge branch 'feature/61' into develop

Close #61

Author: heiglandreas

CHANGELOG.md

@@ -14,7 +14,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Removed
 
-- Nothing.
+- [#61](https://github.com/zendframework/zend-ldap/pull/61) Removed support for PHP 5.5.
 
 ### Fixed
 

composer.json

@@ -13,7 +13,7 @@
         }
     },
     "require": {
-        "php": "^5.5 || ^7.0",
+        "php": "^5.6 || ^7.0",
         "ext-ldap": "*"
     },
     "require-dev": {