Make `login()` return a promise

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 build
+npm-debug.log

lib/login.js

@@ -68,10 +68,7 @@ async function register () {
 }
 
 export default function () {
-  register().then((loginData) => {
+  return register().then((loginData) => {
     return fs.writeFile(pathJoin(homedir(), '.now.json'), JSON.stringify(loginData));
-  }).then(() => {
-    console.log('> Registration successful. `now` is now ready to use. Your credentials are stored in `~/.now.json`');
-    process.exit(0);
   });
 }

scripts/post-install.js

@@ -1,3 +1,6 @@
 import login from '../lib/login';
 
-login();
+login().then(() => {
+  console.log('> Logged in successfully. Token saved in ~/.now.json');
+  process.exit(0);
+});