[Java] Update README.

Author: mjpt777

README.md

@@ -36,7 +36,7 @@ Example for Maven:
 <dependency>
     <groupId>uk.co.real-logic</groupId>
     <artifactId>sbe-all</artifactId>
-    <version>1.15.0</version>
+    <version>1.16.0</version>
 </dependency>
 ```
 
@@ -64,7 +64,7 @@ Jars for the executable, source, and javadoc for the various modules can be foun
 
 An example to execute a Jar from command line using the 'all' jar which includes the Agrona dependency:
 
- java -Dsbe.generate.ir=true -Dsbe.target.language=Cpp -Dsbe.target.namespace=sbe -Dsbe.output.dir=include/gen -Dsbe.errorLog=yes -jar sbe-all/build/libs/sbe-all-1.15.0.jar my-sbe-input.xml
+ java -Dsbe.generate.ir=true -Dsbe.target.language=Cpp -Dsbe.target.namespace=sbe -Dsbe.output.dir=include/gen -Dsbe.errorLog=yes -jar sbe-all/build/libs/sbe-all-1.16.0.jar my-sbe-messages.xml
 
 C++ Build using CMake
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