[issue-679] Update connector version to 0.12.0-SNAPSHOT (#681)
[issue-679] Update connector version to 0.12.0-SNAPSHOT (#681)

Signed-off-by: Fan, Yang <4ebfbad2fa678eac971955932fe390778bba5851@emc.com>
pravega/flink-connectors,pravega/flink-connectors