Breaking changes in 0.1.8

[lordoffreaks]

Hi

First of all thank a lot for the great work, just a suggestion, given the autoloading has changed in https://github.com/roderik/pwgen-php/tree/0.1.8 and now instead of use PWGen;library has to imported as use PWGen\PWGen; , it would be a good idea to increase the minor version to 2, like in 0.2.0 to let knwo that there's a breaking change

Or maybe come back to use PWGen; by creating an extra folder

Thanks!!!