ssm_maintenance_window_target should support multiple targets

[srhaber]

The SSM Maintenance Window Target resource can accept up to 5 different key/val tags. However, the provider limits us to 1 key/val.

https://github.com/terraform-providers/terraform-provider-aws/blob/master/aws/resource_aws_ssm_maintenance_window_target.go#L35

This should be a simple fix in theory (just change MaxItems to 5).

[atsushi-ishibashi]

Close

[radeksimko]

Addressed in #2361 - thanks @atsushi-ishibashi !

[ghost]

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