Update for 0.9.0

Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>

Author: brian-brazil

README.md

@@ -41,25 +41,25 @@ version can be found on in the maven repository for
 <dependency>
   <groupId>io.prometheus</groupId>
   <artifactId>simpleclient</artifactId>
-  <version>0.8.1</version>
+  <version>0.9.0</version>
 </dependency>
 <!-- Hotspot JVM metrics-->
 <dependency>
   <groupId>io.prometheus</groupId>
   <artifactId>simpleclient_hotspot</artifactId>
-  <version>0.8.1</version>
+  <version>0.9.0</version>
 </dependency>
 <!-- Exposition HTTPServer-->
 <dependency>
   <groupId>io.prometheus</groupId>
   <artifactId>simpleclient_httpserver</artifactId>
-  <version>0.8.1</version>
+  <version>0.9.0</version>
 </dependency>
 <!-- Pushgateway exposition-->
 <dependency>
   <groupId>io.prometheus</groupId>
   <artifactId>simpleclient_pushgateway</artifactId>
-  <version>0.8.1</version>
+  <version>0.9.0</version>
 </dependency>
 ```