Syntax highlighting of hello world example

Author: markhatton

README.md

@@ -21,7 +21,7 @@ $ sbt assembly
 ```
 
 Create a "Hello World" AWS Data Pipeline definition Scala file:
-```
+```scala
 object HelloWorldPipeline {
 
   import datapipeline.dsl._
@@ -58,4 +58,4 @@ For details see [Supported Objects](Supported%20Objects.md).
 
 ## License
 
-This tool is licensed under [Apache License 2.0](LICENSE).
+This tool is licensed under [Apache License 2.0](LICENSE).