Remove Redis version from test instructions
Remove Redis version from test instructions

The version of Redis we test against is already listed at the top of the
README.

Change-Id: Ib6f3dcc2a756cd6581e6dffe3228e649233986d5
Reviewed-on: http://gerrit.causes.com/45136
Reviewed-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>
Tested-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>

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