feat!: quiqqer v2

BREAKING CHANGE: quiqqer v2 has been renamed to quiqqer/core. a new major version will be created here so that we can still develop for both versions.

composer.json

 {
-  "name": "quiqqer\/coupons",
+  "name": "quiqqer/coupons",
   "type": "quiqqer-module",
   "description": "Coupons for QUIQQER",
   "license": "GPL-3.0+",
@@ -7,7 +7,7 @@
     {
       "name": "Patrick M\u00fcller",
       "email": "support@pcsg.de",
-      "homepage": "https:\/\/www.pcsg.de",
+      "homepage": "https://www.pcsg.de",
       "role": "Developer"
     }
   ],
@@ -15,14 +15,14 @@
     "email": "support@pcsg.de"
   },
   "require": {
-    "quiqqer\/quiqqer": "^2",
-    "quiqqer\/erp": "^3.2",
-    "quiqqer\/discount": "^2",
+    "quiqqer/core": "^2",
+    "quiqqer/erp": "^3.2",
+    "quiqqer/discount": "^2",
     "quiqqer/products": "^2"
   },
   "autoload": {
     "psr-4": {
-      "QUI\\ERP\\Coupons\\": "src\/QUI\/ERP\/Coupons"
+      "QUI\\ERP\\Coupons\\": "src/QUI/ERP/Coupons"
     }
   }
 }