courier: Extend TODO for DNS error handling on Go >= 1.13
In https://github.com/albertito/chasquid/issues/4, ludusrusso comments that the DNS lookup error handling in the SMTP courier could be improved by using DNSError.IsNotFound. That is true, but unfortunately it was only added in Go 1.13, and we are currently trying to support Go 1.11 since that's what in Debian stable. So this patch updates the TODO to note this, so that when we can use a newer Go version, we improve this code.
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