fix composer install

Author: FlyersWeb

back-end/composer.json

@@ -5,6 +5,7 @@
         "php": "^7.1.3",
         "ext-ctype": "*",
         "ext-iconv": "*",
+        "doctrine/doctrine-cache-bundle": "^1.3",
         "friendsofsymfony/rest-bundle": "^2.6",
         "friendsofsymfony/user-bundle": "^2.0",
         "nelmio/cors-bundle": "^2.0",