[Capacitor v3] use 'registerPlugin' func instead of using registerWebPlugin (#82)

* fix: use 'registerPlugin' func instead of using registerWebPlugin

* feat: pass proxy plugin for native (do not pass web plugin object directly)

Author: leo6104

package-lock.json

@@ -13,11 +13,11 @@
   "author": "CodetrixStudio",
   "license": "MIT",
   "dependencies": {
-    "@capacitor/core": "latest"
+    "@capacitor/core": "^3.0.0-beta.2"
   },
   "devDependencies": {
-    "@capacitor/android": "latest",
-    "@capacitor/ios": "latest",
+    "@capacitor/android": "^3.0.0-beta.2",
+    "@capacitor/ios": "^3.0.0-beta.2",
     "@types/gapi": "0.0.36",
     "@types/gapi.auth2": "0.0.50",
     "typescript": "^3.2.4"

package.json

@@ -1,4 +1,4 @@
-import { WebPlugin } from '@capacitor/core';
+import { registerPlugin, WebPlugin } from '@capacitor/core';
 import { GoogleAuthPlugin } from './definitions';
 import { User, Authentication } from './user';
 
@@ -132,9 +132,7 @@ export class GoogleAuthWeb extends WebPlugin implements GoogleAuthPlugin {
   }
 }
 
-const GoogleAuth = new GoogleAuthWeb();
+const GoogleAuth = registerPlugin('GoogleAuth', { web: new GoogleAuthWeb() });
 
 export { GoogleAuth };
 
-import { registerWebPlugin } from '@capacitor/core';
-registerWebPlugin(GoogleAuth);