[BUG] Exception thrown on valid input

[estebanthebad]

https://github.com/sms77io/php-client/blob/ec0339d72bcdfa930b80ab1c8cd2e2838b944d46/src/Validator/SmsValidator.php#L115

This code block throws an exception if the string consists of valid characters but solely of characters listed in SmsConstants::FROM_ALLOWED_CHARS. Because after the replace command the string will be empty and ctype_alnum() will return FALSE.

[matthiez]

thanks for reporting @estebanthebad will fix asap in the next release but im quite busy with other stuff atm - feel free to open a pull request on your own though :)

[cl77]

Fixed with latest release.