fix hstream server version in README

Author: daleiz

README.md

@@ -8,7 +8,7 @@ This is the offical Java client library for [HStreamDB](https://hstream.io/).
 
 **Please use the latest released version.** 
 
-**The latest release is v0.3.0, which requires hstream server v0.5.1.x.**
+**The latest release is v0.3.0, which requires hstream server v0.5.2 .**
 
 ## Content 
 - [Installation](#installation)