feat: vuejs#128 add version display

Author: thewei

src/index.ts

@@ -1,6 +1,7 @@
 export { createApp } from './app'
 export { nextTick } from './scheduler'
 export { reactive } from 'vue'
+export { version } from '../package.json'
 
 import { createApp } from './app'
 

tsconfig.json

@@ -11,7 +11,8 @@
     "strict": true,
     "noUnusedLocals": true,
     "rootDir": ".",
-    "types": ["vite/client"]
+    "types": ["vite/client"],
+    "resolveJsonModule": true
   },
   "include": [
     "src"