Fix service typo (#5)

Author: cesargb

src/Contracts/Runnable.php

@@ -6,8 +6,6 @@ interface Runnable
 {
     /**
      * Must run parent::run() to validate request
-     *
-     * @return void
      */
-    public function run(): void;
+    public function run(): mixed;
 }

src/Services/AbstractService.php

@@ -16,9 +16,11 @@ public function __construct(array|Request $request)
             : new Request($request);
     }
 
-    public function run(): void
+    public function run(): mixed
     {
         $this->validate();
+
+        return null;
     }
 
     protected function validations(): array

tests/Feature/Services/ServiceTest.php

@@ -44,10 +44,10 @@ protected function validations(): array
         ];
     }
 
-    public function run(): void
+    public function run(): mixed
     {
         parent::run();
 
-        // Do something
+        return null;
     }
 }