Tried this
composer require hubbox/magento2:3.0.1 --no-update
Got error in terminal
[InvalidArgumentException] Could not find a matching version of package hubbox/magento2. Check the package spelling, your version constraint and that the package is available in a stability which matches your minim um-stability (stable).
As the error suggests you need to check if the spelling, version & minimum-stability of the package is correct.
For the stability part:
If the package doesn't have a stable version then you may need to change the minimum-stabilityto dev in composer.json
Please check https://getcomposer.org/doc/04-schema.md#minimum-stability
