Dump error codes as strings instead of integers #25
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First commit in this PR adds a test for the current behaviour and then the second commit actually fixes #21. Edit: because of #24 and #26 the added test didn't pass consistently enough to merge so I had to remove it.
This is going to be a breaking change (changing the type of "code" from integer to string) but the old value is of little value to users. If for some reason they want to select based on status code numbers the mapping can be found here: https://github.com/grpc/grpc/blob/master/doc/statuscodes.md