fix: composer version

composer.json

@@ -2,7 +2,7 @@
   "name": "quiqqer/coupons",
   "type": "quiqqer-module",
   "description": "Coupons for QUIQQER",
-  "version": "dev-dev",
+  "version": "dev-master",
   "license": "GPL-3.0+",
   "authors": [
     {
@@ -24,4 +24,4 @@
       "QUI\\ERP\\Coupons\\": "src/QUI/ERP/Coupons"
     }
   }
-}
\ No newline at end of file
+}