add missing link to r/ApacheWayang (#209)

diff --git a/README.md b/README.md
index b90ce02..c7600d4 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 ![GitHub forks](https://img.shields.io/github/forks/apache/incubator-wayang?style=for-the-badge)
 ![GitHub Repo stars](https://img.shields.io/github/stars/apache/incubator-wayang?style=for-the-badge)
 
-[![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Apache%20Wayang%20enables%20cross%20platform%20data%20processing,%20star%20it%20via:%20&url=https://github.com/apache/incubator-wayang&via=apachewayang&hashtags=dataprocessing,bigdata,analytics,hybridcloud,developers) ![Subreddit subscribers](https://img.shields.io/reddit/subreddit-subscribers/ApacheWayang?style=social)
+[![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Apache%20Wayang%20enables%20cross%20platform%20data%20processing,%20star%20it%20via:%20&url=https://github.com/apache/incubator-wayang&via=apachewayang&hashtags=dataprocessing,bigdata,analytics,hybridcloud,developers) [![Subreddit subscribers](https://img.shields.io/reddit/subreddit-subscribers/ApacheWayang?style=social)](https://www.reddit.com/r/ApacheWayang/)
 
 #### The API first cross-platform data processing system