changed cassandra connector version to 1.2.1
changed cassandra connector version to 1.2.1

operasoftware/pyspark-cassandra,TargetHolding/pyspark-cassandra,omriiluz/pyspark-cassandra,omriiluz/pyspark-cassandra,operasoftware/pyspark-cassandra,TargetHolding/pyspark-cassandra