Update README.md

README.md

@@ -3,7 +3,7 @@ Redisson: Redis based In-Memory Data Grid for Java.
 [Quick start](https://github.com/redisson/redisson#quick-start) | [Documentation](https://github.com/redisson/redisson/wiki) | [Javadocs](http://www.javadoc.io/doc/org.redisson/redisson/3.3.2) | [Changelog](https://github.com/redisson/redisson/blob/master/CHANGELOG.md) | [Code examples](https://github.com/redisson/redisson-examples) | [Support chat](https://gitter.im/mrniko/redisson) | [Ultra-fast version](https://redisson.pro)
 
 Based on high-performance async and lock-free Java Redis client and [Netty](http://netty.io) framework.  
-Redis 2.8+ compatible.
+## Please take part in [Redisson survey](https://www.surveymonkey.com/r/QXQZH5D)
 
 | Stable Release Version | JDK Version compatibility | Release Date |
 | ------------- | ------------- | ------------|