Add Boolean for UseOpsworksSecurityGroups (#203)
Add Boolean for UseOpsworksSecurityGroups (#203)

http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-opsworks-stack.html#cfn-opsworks-stack-useopsworkssecuritygroups
kornypoet/cfndsl,webdevwilson/cfndsl,jonjitsu/cfndsl,stevenjack/cfndsl,elmobp/cfndsl,kornypoet/cfndsl,stevenjack/cfndsl,elmobp/cfndsl