modify contract.

app/User.php

@@ -3,10 +3,10 @@
 use Illuminate\Auth\Authenticatable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Auth\Passwords\CanResetPassword;
-use Illuminate\Contracts\Auth\User as UserContract;
+use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
 use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;
 
-class User extends Model implements UserContract, CanResetPasswordContract {
+class User extends Model implements AuthenticatableContract, CanResetPasswordContract {
 
 	use Authenticatable, CanResetPassword;