AWS::ImageBuilder::ImageRecipe.EbsInstanceBlockDeviceSpecification.Vo…

…lumeType AllowedValues expansion (io2) (#1824)

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-imagebuilder-imagerecipe-ebsinstanceblockdevicespecification.html#cfn-imagebuilder-imagerecipe-ebsinstanceblockdevicespecification-volumetype

could be sourced automatically from botocore:
aws-cloudformation/cfn-lint#1682

troposphere/validators.py

@@ -651,7 +651,7 @@ def schedule_pipelineexecutionstartcondition(startcondition):
 
 
 def ebsinstanceblockdevicespecification_volume_type(type):
-    valid_types = ['gp2', 'io1', 'sc1', 'st1', 'standard']
+    valid_types = ['gp2', 'io1', 'io2', 'sc1', 'st1', 'standard']
     if type not in valid_types:
         raise ValueError(
             'VolumeType must be one of: "%s"' % (