update broken link to VeeValidate (#2985)

Author: Robert Rosman

Diff for: src/v2/cookbook/form-validation.md

@@ -437,4 +437,4 @@ We start off with a variable representing the URL of the API that is running on
 While this cookbook entry focused on doing form validation "by hand", there are, of course, some great Vue libraries that will handle a lot of this for you. Switching to a prepackage library may impact the final size of your application, but the benefits could be tremendous. You have code that is (most likely) heavily tested and also updated on a regular basis. Some examples of form validation libraries for Vue include:
 
 * [vuelidate](https://github.com/monterail/vuelidate)
-* [VeeValidate](https://logaretm.github.io/vee-validate/)
+* [VeeValidate](https://vee-validate.logaretm.com/v3/)