修复installed的bug。

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pc-component-v3",
-  "version": "1.0.17",
+  "version": "1.0.19",
   "description": "",
   "main": "dist/pc-component-v3.js",
   "scripts": {

packages/index.js

@@ -88,10 +88,10 @@ const components = [
 const install = function (app, opts = {}) {
   console.log('start install.');
   /* istanbul ignore if */
-  if (install.installed){
-    console.log('pc-component-v3 already installed.');
-    return;
-  }
+  // if (install.installed){
+  //   console.log('pc-component-v3 already installed.');
+  //   return;
+  // }
 
     
   // Vue.use(VueI18n);