Apply fixes from StyleCI (#34)

[ci skip] [skip ci]

Author: mtrajano

src/DataObjects/Route.php

@@ -38,7 +38,7 @@ public function middleware()
         return $this->middleware;
     }
 
-    public function action() : string
+    public function action(): string
     {
         return $this->route->getActionName();
     }

src/Generator.php

@@ -179,7 +179,7 @@ protected function addActionScopes()
         }
     }
 
-    protected function getFormRules() : array
+    protected function getFormRules(): array
     {
         $action_instance = $this->getActionClassInstance();
 
@@ -218,7 +218,7 @@ protected function getParameterGenerator($rules)
         }
     }
 
-    private function getActionClassInstance() : ?ReflectionMethod
+    private function getActionClassInstance(): ?ReflectionMethod
     {
         [$class, $method] = Str::parseCallback($this->route->action());