update version

Author: nkzawa

pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>io.socket</groupId>
   <artifactId>engine.io-client</artifactId>
-  <version>0.8.4-SNAPSHOT</version>
+  <version>0.9.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>engine.io-client</name>
   <description>Engine.IO Client Library for Java</description>