Updated to reflect 0.9.0 release

Author: lhazlewood

README.md

@@ -68,15 +68,15 @@ Maven:
 <dependency>
     <groupId>io.jsonwebtoken</groupId>
     <artifactId>jjwt</artifactId>
-    <version>0.7.0</version>
+    <version>0.9.0</version>
 </dependency>
 ```
 
 Gradle:
 
 ```groovy
 dependencies {
-    compile 'io.jsonwebtoken:jjwt:0.7.0'
+    compile 'io.jsonwebtoken:jjwt:0.9.0'
 }
 ```