fix readme

Author: witochandra

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://travis-ci.org/witochandra/webfeed.svg?branch=master)](https://travis-ci.org/witochandra/webfeed)
 [![Pub](https://img.shields.io/pub/v/webfeed.svg)](https://pub.dartlang.org/packages/webfeed)
 
-A dart package for parsing RSS and Atom feed. Supporting
+A dart package for parsing RSS and Atom feed.
 
 ### Features