Add notes about adding request params manually

I spent a little time trying to figure out how to include params, and thought it would be nice to include in the readme since it ends up being so easy, after you know how it works :)
Typo in last Readme edit
Update changelog and add structure

  * renamed CHANGES.md to CHANGELOG.md
  * move changes from README.md to CHANGELOG.md
  * add structure that follows http://keepachangelog.com/
Add readability suggestions from Ben
Merge pull request #64 from mltsy/master

Add a note about logging request params manually?
remove unnecessary headings from changelog
Merge pull request #79 from pxlpnk/update_changelog

Update changelog and add structure