Update README.md

fix typo.
Add a link to Fluentd.org
Merge pull request #3 from toru-takahashi/patch-1

Update README.md
Merge pull request #4 from kiyoto/master

Add a link to fluentd.org in README
Remove state_file warning to SQLOutput.

Now if state_file is set on <source>, warning is raised.
To fix this, remove state_file from TableElement to SQLOutput.
Add socket config_param.
Merge pull request #8 from yui-knk/fix-state_file-warn

Remove state_file warning to SQLOutput.
Add socket config_param to out_sql.
Merge pull request #9 from yui-knk/add-socket-param

Add socket config_param.
Unify error handling
v0.3.0
Document out_sql
Merge pull request #11 from kiyoto/master

Document out_sql