0.14.3

Update README.md

0.14.2

Update Namespace for Consistency

- Changed the namespace from `Exbil` to `MsCode` across all PHP files for consistency.
- Updated the `use` statements to reflect the new namespace in `Aliases.php`, `Domains.php`, `Credentials.php`, `MailCowAPI.php`, `AssertNotImplemented.php`, `MailBoxes.php`, `AntiSpam.php`, and `ParameterException.php`.
- Modified the `composer.json` to autoload the new namespace `MsCode\Mailcow\`.
- Corrected the namespace usage in `README.md` to reflect the updated structure.