Added bash tags to readme

README.md

@@ -8,13 +8,13 @@ You need to have [ammonite](https://ammonite.io) installed.
 
 Once you have done that, start a local instance of Chatto, and run the command -
 
-``` scala
+``` bash
 amm stompTest.sc --username yourusername --password yourpassword
 ```
 
 or
 
-```
+``` bash
 ./stompTest.sc --username yourusername --password yourpassword
 ```