Use correct logger method for warnings (#444)
Use correct logger method for warnings (#444)

Spoiler, it's `warn`, not `warning`.
treshugart/lerna,doug-wade/lerna,tbayaa/lerna,onigoetz/lerna-hg,lerna/lerna,lerna/lerna,FaHeymann/lerna,evocateur/lerna,kittens/lerna,lerna/lerna,sebmck/lerna,evocateur/lerna