Controller Constructor called twice

| Q | A
| ----------------- | ---
| Bug? |yes
| New Feature? | no
| Framework | Laravel
| Framework version | 5.3+
| Package version | 2.0.0-alpha1
| PHP version | 7.2.11

#### Actual Behaviour

My controller constructors are being called twice. It appears that there are two different instantiations of the Controller taking place upon execution.

#### Expected Behaviour

One instance of controller being instantiated.

#### Steps to Reproduce

1. Laravel 5.7 installation + dingo 2.0.0-alpha1
2. Create new controller and define a constructor with an echo statement
3. Add route to new controller method.
4. Load page at route defined above. You will see constructor output twice.

#### Possible Solutions

This is probably not correct, but currently I have had to convert Route.php line 283 to:
$this->container->instance($this->controllerClass, $this->controller);