Proper error code and message when failing #295
Merged
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Prior to this, the CLI would exit with
UnhandledPromiseRejectionWarning
and a full stack trace when an error occurred.
With this change, set an error code indicating failure and only display
the error message by default. The stack trace is printed with --verbose.
Furthermore, the loud-rejection handler is registered to fail properly
if any rejected promises snuck past our handling.