Move dependency fzaninotto/faker from dev packages to regular packages

[oskosk]

The fzaninotto/fakerdependency is declared as a development package on composer.json but it seems that it should live among regular dependencies, given that doing composer install --no-dev (after this plugin is cloned/downloaded), ends up with a missing runtime dependency.

Changes proposed in this Pull Request:

• Moves the dependency fzaninotto/faker from the section require-dev to require in composer.json
• Moves the matching block for fzaninotto/faker in composer.lock from pacakges-dev to packages.

Testing instructions>

• Checkout this branch.
• To verify this changeset is proper, remove your local vendor directory in case it's present.
• Run composer install --no-dev from inside the wc-smooth-generator directory.
• Confirm you can run this plugin properly with the installed packages.
• To rollback this changeset, remove the vendor directory, checkout to master and run composer install.

[rodrigoprimo]

Thanks for your help.

[oskosk]

Thanks @rodrigoprimo !