Creates changes files for us to start documenting our changes; fixes #41...

Creates changes files for us to start documenting our changes; fixes #41. 

The purpose of this file is to track changes when they happen, so if someone is using the project they can see what has been updated with the most recent release. 

This is a draft at this. Feel free to add points that I might have missed. 

Examples of changes/history files from other projects --- 
https://github.com/clojure/clojure/blob/master/changes.md
https://github.com/kennethreitz/requests/blob/master/HISTORY.rst