User-friendly message for token validation error #30
Description
When an invalid token is passed to DiscordHostConfiguration on ConfigureDiscordShardedHost() and ConfigureDiscordHost(), an OptionsValidationException exception is thrown with message: "A validation error has occurred.".
This message, however, doesn't doesn't explain what went wrong or what's the root cause of the issue.
I suggest adding a custom, user-friendly message like "An empty or invalid token was provided." on the Validate method.
This will make debugging and troubleshooting easier.