update example pom and readme version (#76)

* update example pom

* update README

README.md

@@ -32,7 +32,7 @@ Apache Maven
 
 Gradle/Grails 
 
-`compile 'io.milvus:milvus-sdk-java:0.3.0'`
+`compile 'io.milvus:milvus-sdk-java:0.4.0'`
 
 ### Examples
 

examples/pom.xml

@@ -63,7 +63,7 @@
         <dependency>
             <groupId>io.milvus</groupId>
             <artifactId>milvus-sdk-java</artifactId>
-            <version>0.4.0-SNAPSHOT</version>
+            <version>0.4.0</version>
         </dependency>
     </dependencies>