Ensure that frame errors are reported and errors are reported as strings.
Merge pull request #3 from Sumo-MBryant/error-reporting

Ensure that frame errors are reported and errors are reported as strings.
Exposed the close reason in the onclose callback.
Merge pull request #2 from Sumo-MBryant/close-reason

Exposed the close reason to the client.
Update changelog
Bump version to 1.1.0