Most of the calls to parseResponse in client have unchecked err values

[myrade]

eg. https://github.com/provideservices/provide-go/blob/dev/api/client.go#L219

There are 14 instances in this file. Might need to add more logic as well - in the case that triggered it I timed out the handler with an enormous request so resp.StatusCode was invalid and caused a panic. We're attacking the request size elsewhere, but something that might need to be addressed here too.