Update changelog with SCAN command
Update changelog with SCAN command

Change-Id: I7411ce07f78b104667262b0f11f1aaffa16453db
Reviewed-on: http://gerrit.causes.com/44286
Reviewed-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>
Tested-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>

brigade/mock_redis,tsubery/mock_redis,GearboxSoftware/mock_redis,batizhevsky/mock_redis,anujdas/mock_redis