Set version to 6.2.1
Set version to 6.2.1

Change-Id: I8410908ba892748338dc13eebc4483686bbdfd93
Reviewed-on: https://gerrit.franz.com:9080/7112
Reviewed-by: Ahmon Dancy <8f7d8ce2c6797410ae95fecd4c30801ee9f760ac@franz.com>
Tested-by: Ahmon Dancy <8f7d8ce2c6797410ae95fecd4c30801ee9f760ac@franz.com>

franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python