update README

Signed-off-by: [email protected] <[email protected]>
DoraALin · Apr 14, 2017 · c5a3bee · c5a3bee
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 [![GitHub release](https://img.shields.io/github/release/doraalin/flume-nsq-sink.svg)](https://github.com/doraalin/flume-nsq-sink/releases/latest)
 
-**flume-nsq-sink** is apache flume sink for port flume events to NSQ. Install as plugin and follow usecase to configure 
-sink in conf file.
+**flume-nsq-sink** is apache flume sink for port flume events to NSQ, with a local backup file tool to backup event body which failed in publish.
+ Install as plugin and follow usecase to configure sink in conf file.
 
 ## Installation and Usecase
 1. Run '_mvn package'_ to package plugin in path _./nsq-sink_. place folder in your ${FLUME_HOME}/plugin.d/