refactor: composer.json requirements

composer.json

@@ -15,6 +15,10 @@
   "support": {
     "email": "support@pcsg.de"
   },
+  "require": {
+    "quiqqer/quiqqer": "^1.2|*@dev",
+    "quiqqer/discount": "^1|*@dev"
+  },
   "autoload": {
     "psr-4": {
       "QUI\\ERP\\Coupons\\": "src/QUI/ERP/Coupons"