Added Changelogs (#86)

* Added changelogs

* Update for tagging

* Minor

Author: Nyholm

Changelog.md

@@ -0,0 +1,19 @@
+# Change Log
+
+The change log describes what is "Added", "Removed", "Changed" or "Fixed" between each release. 
+
+## UNRELEASED
+
+## 0.2.2
+
+### Added
+
+Support for PHP7
+
+### Changed
+
+* The `MemcachedCachePool::$cache` is now protected instead of private
+
+## 0.2.1
+
+No changelog before this version