Create CHANGELOG.md

Added CHANGELOG file for updates.

Author: susyabashti

CHANGELOG.md

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+# Changelog
+    -Version: 0.4 (06/05/2019)
+    * Bug fixes
+    * Added MySQL saving method.
+    * A few changes in the menu typo.
+    * MySQL method: Added email field with forgot password option included.
+    * Plugin API: Added forwards.
+
+    - Version: 0.1 (04/05/2019)
+    * Public release