Added postcss-mqwidth-to-class plugin under Fallbacks
Added postcss-mqwidth-to-class plugin under Fallbacks

OEvgeny/postcss,alexmchardy/postcss,andrepolischuk/postcss,johnie/postcss,mshahidkhan/postcss,omeripek/postcss,XOP/postcss,phillipalexander/postcss,alanev/postcss,qiucanghuai/postcss,postcss/postcss,pascalduez/postcss,MadLittleMods/postcss,bendtherules/postcss,Paddy-Hamilton/postcss,postcss/postcss,maximkoretskiy/postcss,asan/postcss,dehuszar/postcss,marek-saji/postcss,johnotander/postcss,Semigradsky/postcss,bezoerb/postcss,wjb12/postcss,himynameisdave/postcss,marcustisater/postcss,gitkiselev/postcss,smagic39/postcss,kk9599/postcss,LucasFrecia/postcss,sandralundgren/postcss,eprincev-egor/postcss,KivyGogh/postcss,jedmao/postcss,mahtd/postcss,jonathantneal/postcss,mdegoo/postcss,Shugar/postcss