`install.sh`: Don't give detached HEAD advice when installing
`install.sh`: Don't give detached HEAD advice when installing

creationix/nvm,PeterDaveHelloKitchen/nvm,PeterDaveHelloKitchen/nvm,edwmurph/nvm,ljharb/nvm,PeterDaveHello/nvm,creationix/nvm,edwmurph/nvm,evocateur/nvm,ljharb/nvm,evocateur/nvm,PeterDaveHello/nvm