changelog for v1.3

Merge pull request bshaffer#288 from bshaffer/develop

Create Tag v1.2

Merge pull request bshaffer#276 from bshaffer/develop

Create Tag v1.1

fixes unnecessary BC breaking changes made by 69ba3a2

last tag supporting php 5.2

v0.8 - server and grant type refactor

increments tag in readme

Merge branch 'develop'

v0.5 for BC breaks on P.R. bshaffer#77

new stable version - prepping for b.c. breaks