Change minimum stability to stable

[peter279k]

As title, the minimum-stability defines the dev in composer.json and this will tell composer to install the development package version.

I think we should change into stable because nobody want to install a development package on their web applications/services.

[papac]

Ok thank you @peter279k. Can You fixed it and make a PR.

[peter279k]

@papac, I will create related PR to solve this issue at my available time :).

Thank you for your concern again.