Updated for grind-framework 0.4.2 async boot

Author: shnhrrsn

boot/Cli.js

@@ -4,5 +4,4 @@ import 'App/Providers/CommandsProvider'
 const app = require('App/Bootstrap')
 app.providers.push(CliProvider, CommandsProvider)
 
-app.boot()
-app.cli.run()
+app.boot().then(() => app.cli.run())