Update README.MD

-changed version to 1.2.1
-proper "setLogging()" usage with "getDefault()"
Merge pull request #131 from Kidoki/master

Update README.md
Merge branch 'master' of https://github.com/koush/ion

# By Egor
# Via Egor (1) and Koushik Dutta (1)
* 'master' of https://github.com/koush/ion:
  Update README.MD