Update README.md
Merge pull request #230 from TheFinestArtist/patch-1

Update README.md (socket.io version)
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By Tae Hwan Kim
# Via Koushik Dutta (1) and Tae Hwan Kim (1)
* 'master' of https://github.com/koush/AndroidAsync:
  Update README.md