ec2.py - AWS::EC2::TransitGateway object does not support attribute Description

[bwdbethke]

I'm getting AttributeError: AWS::EC2::TransitGateway object does not support attribute Description

I noticed in ec2.py that Description isn't in the class's list of props

class TransitGateway(AWSObject):
    resource_type = "AWS::EC2::TransitGateway"
    props = {
        'AmazonSideAsn': (integer, False),
        'AutoAcceptSharedAttachments': (basestring, False),
        'DefaultRouteTableAssociation': (basestring, False),
        'DefaultRouteTablePropagation': (basestring, False),
        'DnsSupport': (basestring, False),
        'Tags': ((Tags, list), False),
        'VpnEcmpSupport': (basestring, False),
    }

but it is mentioned in CloudFormation docs at https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-transitgateway.html

{
  "Type" : "AWS::EC2::TransitGateway",
  "Properties" : {
      "AmazonSideAsn" : Integer,
      "AutoAcceptSharedAttachments" : String,
      "DefaultRouteTableAssociation" : String,
      "DefaultRouteTablePropagation" : String,
      "Description" : String,
      "DnsSupport" : String,
      "Tags" : [ Tag, ... ],
      "VpnEcmpSupport" : String
    }
}

other classes in ec2.py like TrafficMirrorTarget right above it include 'Description': (basestring, False), so maybe that should be added to TransitGateway

[markpeek]

Thanks...pushed this change to master.