Minor tweaks to code.

Also removed a useless method, most likely a leftover from the past.

lib/Predis/Protocol/Text/ComposableProtocolProcessor.php

@@ -41,14 +41,6 @@ class ComposableProtocolProcessor implements ProtocolProcessorInterface
         $this->setResponseReader($reader ?: new ResponseReader());
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function serialize(CommandInterface $command)
-    {
-        return $this->serializer->serialize($command);
-    }
-
     /**
      * {@inheritdoc}
      */