message: docs: add continues modifier note in the required rule description
diff: @@ -393,6 +393,10 @@ By default, the boolean value of `false` will pass validate. Setting invalidateF
  <input v-validate="'required'" data-vv-as="field" :class="{'input': true, 'is-danger': errors.has('required_field') }" name="required_field" type="text" placeholder="Is Required">
  <span v-show="errors.has('required_field')" class="help is-danger">{{ errors.first('required_field') }}</span>
  +::: tip
  + The `required` rule is special, by default the validator skips the validation for non-required fields that have an empty value. If you wish to force validation for non-required fields, use the [`continues` modifier](/api/directive.md#continues).
  +:::
  +
  ## size
  The file size added to the field under validation must not exceed the specified size in kilobytes.
  