fixed command line verrsion of how to run the program

README.md

@@ -39,7 +39,7 @@ You should see the output "Hello World!" displayed on the console.
 
 ## Command line
 
-```java -Djava.library.path=jni -cp bin HelloJNI```
+```java -Djava.library.path=jni -cp bin java_exercises7_1_1.HelloJNI```