Remove deprecated ModMenu API (#95)

* Remove deprecated ModMenu API

* Update fabric.mod.json

fabric/src/main/resources/fabric.mod.json

@@ -27,6 +27,8 @@
     },
     "accessWidener": "cloth-config.accessWidener",
     "custom": {
-        "modmenu:api": true
+        "modmenu": {
+            "badges": [ "library" ]
+        }
     }
 }