Use correct call in PDO_CASSANDRA_ATTR_RANDOMIZE

Use setRandomize() call instead of setMaxConsecutiveFailures() in
PDO_CASSANDRA_ATTR_RANDOMIZE case.
Readme update
Readme update
Merge branch 'master' of https://github.com/Skunnyk/YACassandraPDO into Skunnyk-master
Merge branch 'Skunnyk-master' into 2.0_experimental