Updated PySpark on Azure with AZTK (markdown)

PySpark-on-Azure-with-AZTK.md

@@ -46,7 +46,7 @@ Feel free to modify the other parameters as needed.
 To install __mmlspark__, you will need to add the following line into at the end of `.aztk/spark-defaults.conf`:
 ```conf
 ...
-spark.jars.packages    Azure:mmlspark:0.11 
+spark.jars.packages    Azure:mmlspark:0.12
 ...
 ```