chore(release): set package.json to 4.0.0 [skip ci]

# [4.0.0](v3.10.0...v4.0.0) (2022-12-28)

### Features

* [#93](#93) skip email validation if the field is empty ([d2b83fe](d2b83fe))
* add integer rule ([9b805fe](9b805fe))

### BREAKING CHANGES

* number rule accepts float number now
* email rule is not triggered if the field is empty

package.json

@@ -1,6 +1,6 @@
 {
   "name": "just-validate",
-  "version": "3.10.0",
+  "version": "4.0.0",
   "description": "Modern, simple, lightweight (~5kb gzip) form validation library written in Typescript, with no dependencies (no JQuery!). Support a wide range of predefined rules, async, files, dates validation, custom error messages and styles, localization. Support writing custom rules and plugins.",
   "scripts": {
     "lint-md": "remark . --output",