Updating README
Updating README

Added a bit more information to the install procedure, since it was using an uppercase `Carbon` which breaks some of composer's new tooling and added a note for users to avoid using `*`
jarnovanleeuwen/Carbon,pierredup/Carbon,dlepaux/Carbon,serima/Carbon,relaxsd/Carbon,hinternet/Carbon,lucasmichot/Carbon,meebio/Carbon,ccarteronline/Carbon,ybr-nx/Carbon,lndj/Carbon,rafwlaz/Carbon,Klinche/Carbon,damnedest/Carbon,kylekatarnls/Carbon,m4nt4s/Carbon,briannesbitt/Carbon,cl4rke/Carbon,aziraphale/Carbon,tiagocardosos/Carbon,lanort/Carbon,masterweb121/Carbon,localheinz/Carbon,Gerardo-junior/Carbon,mubassirhayat/Carbon,duyhuynhngoc/Carbon,IPQ-Tecnologia/Carbon,lucas-macedo/Carbon,EazyServer/Carbon,agolomazov/Carbon,nicholas-eden/Carbon