Do not enable compression if not supported

Author: glensc

src/Saver/UploadSaver.php

@@ -32,7 +32,7 @@ public function isSupported()
     public function save(array $data)
     {
         $json = json_encode($data);
-        $this->submit($this->url, $json, $this->compress);
+        $this->submit($this->url, $json, $this->hasCompression());
 
         return true;
     }
@@ -84,4 +84,12 @@ private function submit($url, $payload, $compress)
             throw new ProfilerException($message);
         }
     }
+
+    /**
+     * @return bool
+     */
+    private function hasCompression()
+    {
+        return $this->compress && function_exists('gzencode');
+    }
 }