Created CHANGELOG entry for #3

Author: weierophinney

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file, in reverse chronological order by release.
+
+## 2.5.2 - TBD
+
+### Added
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- [#3](https://github.com/zendframework/zend-servicemanager/pull/3) properly updates the
+  codebase to PHP 5.5, by taking advantage of the default closure binding
+  (`$this` in a closure is the invoking object when created within a method). It
+  also removes several `@requires PHP 5.4.0` annotations.