Update CacheDataCollector.php (#88)

* Update CacheDataCollector.php

add reset method, which implement Symfony\Component\HttpKernel\DataCollector\DataCollectorInterface and solve deprication

User Deprecated: Implementing "Symfony\Component\HttpKernel\DataCollector\DataCollectorInterface" without the "reset()" method is deprecated since Symfony 3.4 and will be unsupported in 4.0 for class "Cache\CacheBundle\DataCollector\CacheDataCollector".

* Update CacheDataCollector.php

update code style

Author: panki3a

src/DataCollector/CacheDataCollector.php

@@ -69,6 +69,15 @@ public function collect(Request $request, Response $response, \Exception $except
         $this->data['total']['statistics']     = $this->calculateTotalStatistics();
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function reset()
+    {
+        $empty      = ['calls' => [], 'config' => [], 'options' => [], 'statistics' => []];
+        $this->data = ['instances' => $empty, 'total' => $empty];
+    }
+
     /**
      * To be compatible with many versions of Symfony.
      *