loginWith method Null safety
Implementation
static Future<NCMBUser> loginWith(String provider, Map data) async {
NCMBRequest r = new NCMBRequest();
var fields = {'authData': {}};
fields['authData']![provider] = data;
Map response = await r.post('users', fields);
var user = NCMBUser();
await user.setLoginResponse(response);
return user;
}