* Make verbosity level mandatory instead of defaulting to 0 when using --telemetry-url
* Update README docs
* Change TelemetryError struct to enum
* Return TelemetryParsingError instead of a Boxed dyn error
* Replace spaces by tabs
* Add example of expected format for telemetry-url
* Remove UrlParsingError; Call to_string instead of parse for TelemetryEndpoints url