(.gitignore) Add comment about atom workaround line
(.gitignore) Add comment about atom workaround line

jfederico/Hilary,jfederico/Hilary,timdegroote/Hilary,nicolaasmatthijs/Hilary,simong/Hilary,simong/Hilary,Orodan/Hilary,Orodan/Hilary,mrvisser/Hilary,stuartf/Hilary,nicolaasmatthijs/Hilary,mrvisser/Hilary,timdegroote/Hilary,stuartf/Hilary