docs(README): use current jwt-decode style (#348)

Author: tranminhnhat1005

README.md

@@ -331,14 +331,14 @@ All API documentation is generated by typedoc, and [is available in the `typedoc
     - You can get the email address by parsing the JWT token that's returned from any authentication, like so:
     ```js
     import { appleAuth } from '@invertase/react-native-apple-authentication';
-    import jwt_decode from 'jwt-decode';
+    import { jwtDecode } from 'jwt-decode';
 
     const appleAuthRequestResponse = await appleAuth.performRequest({
       requestedOperation: appleAuth.Operation.LOGIN,
       requestedScopes: [appleAuth.Scope.EMAIL, appleAuth.Scope.FULL_NAME]
     });
     // other fields are available, but full name is not
-    const { email, email_verified, is_private_email, sub } = jwt_decode(appleAuthRequestResponse.identityToken)
+    const { email, email_verified, is_private_email, sub } = jwtDecode(appleAuthRequestResponse.identityToken)
     ```
 
 ## Troubleshooting