FIX pb with composer depend lib

composer.json

@@ -15,6 +15,7 @@
         "slim/slim": "^3",
         "respect/validation": "^1.1",
         "guzzlehttp/guzzle": "^6.2",
+        "php-http/curl-client": "^1.7",
         "m4tthumphrey/php-gitlab-api": "dev-master"
     }
 }