Update README.md

Author: mpociot

README.md

@@ -84,6 +84,10 @@ return [
      * Console:
      * Writes the N+1 queries into your browsers console log
      * \BeyondCode\QueryDetector\Outputs\Console::class
+     *
+     * JSON:
+     * Writes the N+1 queries into the response body of your JSON responses
+     * \BeyondCode\QueryDetector\Outputs\Json::class
      */
     'output' => [
         \BeyondCode\QueryDetector\Outputs\Alert::class