update for 1.6.0 release

Using-S3Proxy-in-Java-projects.md

@@ -6,7 +6,7 @@ Java projects can include the latest S3Proxy release via Maven artifacts:
 <dependency>
     <groupId>org.gaul</groupId>
     <artifactId>s3proxy</artifactId>
-    <version>1.5.5</version>
+    <version>1.6.0</version>
 </dependency>
 ```
 
@@ -35,7 +35,7 @@ Sonatype also provides pre-release snapshots:
 <dependency>
     <groupId>org.gaul</groupId>
     <artifactId>s3proxy</artifactId>
-    <version>1.6.0-SNAPSHOT</version>
+    <version>1.6.1-SNAPSHOT</version>
 </dependency>
 ```