Fixed: Introduce people to use "require-dev"
Fixed: Introduce people to use "require-dev"

This change will be applied to the website when we generate the
next release.

ravage84/phpmd,DanielSiepmann/phpmd,JeroenDeDauw/phpmd,behance/phpmd,BernardoSilva/phpmd,phpmd/phpmd,postalservice14/phpmd