feat: support Vue 3.0.0-alpha.4

Author: cexbrayat

generator/template/src/main.js

@@ -1,4 +1,4 @@
 import { createApp } from 'vue'
 import App from './App.vue'
 
-createApp().mount(App, '#app')
+createApp(App).mount('#app')

package.json

@@ -16,8 +16,8 @@
     "vue-loader": "^16.0.0-alpha.1"
   },
   "peerDependencies": {
-    "@vue/compiler-sfc": "^3.0.0-alpha.1",
-    "vue": "^3.0.0-alpha.1"
+    "@vue/compiler-sfc": "^3.0.0-alpha.4",
+    "vue": "^3.0.0-alpha.4"
   },
   "devDependencies": {
     "jest": "^24.9.0",