Update README

- added keywords
yusuke · Oct 7, 2014 · 2efcffd · 2efcffd
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 [![Build Status](https://travis-ci.org/recruit-tech/redpen.svg?branch=master)](https://travis-ci.org/recruit-tech/redpen)
 [![Coverage Status](https://coveralls.io/repos/recruit-tech/redpen/badge.png)](https://coveralls.io/r/recruit-tech/redpen)
 [![Gitter chat](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/recruit-tech/redpen)
+
 RedPen
 =======
 
 A document inspection tool.
 
 See the detail usage in the RedPen [home page](http://redpen.cc/).
 
+Keywords
+========
+
+proofreading,  document inspection, spellchecker
+
 Resources
 ==========