Merge pull request alibaba#499 from asdf2014/github_readme

Add TSDB Reader into README doc

README.md

@@ -57,7 +57,7 @@ DataX目前已经有了比较全面的插件体系，主流的RDBMS数据库、N
 |              | HDFS       |     √     |     √     |[读](https://github.com/alibaba/DataX/blob/master/hdfsreader/doc/hdfsreader.md) 、[写](https://github.com/alibaba/DataX/blob/master/hdfswriter/doc/hdfswriter.md)|
 |              | Elasticsearch       |         |     √     |[写](https://github.com/alibaba/DataX/blob/master/elasticsearchwriter/doc/elasticsearchwriter.md)|
 | 时间序列数据库 | OpenTSDB | √ |  |[读](https://github.com/alibaba/DataX/blob/master/opentsdbreader/doc/opentsdbreader.md)|
-|  | TSDB | | √ |[写](https://github.com/alibaba/DataX/blob/master/tsdbwriter/doc/tsdbhttpwriter.md)|
+|  | TSDB | √ | √ |[读](https://github.com/alibaba/DataX/blob/master/tsdbreader/doc/tsdbreader.md) 、[写](https://github.com/alibaba/DataX/blob/master/tsdbwriter/doc/tsdbhttpwriter.md)|
 
 # 我要开发新的插件
 请点击：[DataX插件开发宝典](https://github.com/alibaba/DataX/blob/master/dataxPluginDev.md)