Cache composer packages on Appveyor
Cache composer packages on Appveyor

fabpot/composer,dzuelke/composer,andrerom/composer,floverdevel/composer,erasys/composer,naderman/composer,composer/composer,stefangr/composer,staabm/composer,SpacePossum/composer,nicolas-grekas/composer,localheinz/composer,stof/composer,alcohol/composer,gencer/composer,pierredup/composer,slbmeh/composer,johnstevenson/composer,milleruk/composer,vdm-io/composer