imp: cleanup composer

composer.json

@@ -29,12 +29,5 @@
     "drupal/accounting": "^1.0",
     "drupal/payment": "^2.1.0",
     "drupal/webform": "^6.0"
-  },
-  "extra": {
-    "branch-alias": {
-      "dev-1.x": "1.0.x-dev",
-      "dev-2.x": "2.0.x-dev"
-    }
-  },
-  "minimum-stability": "dev"
+  }
 }