updated story

Author: mahmoudparsian

README.md

@@ -149,8 +149,11 @@ Original Creator of Apache Spark <br>
 <!--- Data Design Patterns, monoids -->
 <!--- RDD map transformations: map(), flatMap(), mapPartitions() -->
 <!--- RDD reducers: groupByKey(), reduceByKey(), combineByKey() -->
+<!--- RDD actions: reduce(), collect() -->
 <!--- RDD Tutorial -->
 <!--- DataFrame Tutorial -->
 <!--- Join operations -->
 <!--- RDD reducers -->
 <!--- DataFrames creation, manipulation, and transformations -->
+
+-------