Fix Parameters on AWS::Batch::JobDefinition (#1404)
Fix Parameters on AWS::Batch::JobDefinition (#1404)

Parameters is not a required property as per https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-batch-jobdefinition.html#cfn-batch-jobdefinition-parameters
cloudtools/troposphere,ikben/troposphere,johnctitus/troposphere,ikben/troposphere,cloudtools/troposphere,johnctitus/troposphere