chore: release 2.4.0

- deprecate old money methods from users controller
- new balance system:
    + bigint balance
    + easy/safe methods to interact
    + balance limit
- appstate template generator
- custom exception: BalanceError

package.json

@@ -1,6 +1,6 @@
 {
   "name": "xaviabot",
-  "version": "2.3.2",
+  "version": "2.4.0",
   "description": "A Facebook Messenger Bot",
   "main": "index.js",
   "type": "module",