Adding newlines to logger (#290)

Adding newline to LambdaLogPublisher so that logs are intelligible in contract test output in SAM Local

Author: RJ Lohan

src/main/java/software/amazon/cloudformation/loggers/LambdaLogPublisher.java

@@ -28,6 +28,6 @@ public LambdaLogPublisher(final LambdaLogger logger,
 
     @Override
     protected void publishMessage(String message) {
-        this.logger.log(message);
+        this.logger.log(String.format("%s%n", message));
     }
 }