Add informations to upgrade from 1.2.0/1.2.1 to 1.2.2
Add informations to upgrade from 1.2.0/1.2.1 to 1.2.2

thelastpickle/cassandra-reaper,thelastpickle/cassandra-reaper,thelastpickle/cassandra-reaper,thelastpickle/cassandra-reaper,thelastpickle/cassandra-reaper