[1.0.2] update

[1.0.2]

- Fixed a bug where `'status'` was displayed when submitting some codes.
- Fixed bot's description (which was stating that only C++ was supported).
- You can now specify the engine you want to use using its ID (which can be displayed with the `[p]list_engines <language_name>`). Thanks PhirosWolf#5460 for this suggestion.
- You can now mention the bot to invoke commands. This is an alias for the *classic* prefix which should avoid prefixes conflicts. Thanks sha_dryx#2417 for this suggestion.
- Language identifiers now work with lowercase and uppercase (as Discord accepts both). Thanks sha_dryx#2417 for this suggestion.