message: fix: mapFields deprecated imports
diff: import * as Rules from './rules';
  import VeeValidate from './plugin';
  -import mapFields from './core/mapFields';
  import { ValidationProvider, ValidationObserver, withValidation } from './components';
  import { assign } from './utils';
  import en from '../locale/en';
  @@ -18,7 +17,6 @@ VeeValidate.Validator.localize({
  VeeValidate.version = '__VERSION__';
  VeeValidate.Rules = Rules;
  -VeeValidate.mapFields = mapFields;
  VeeValidate.ValidationProvider = ValidationProvider;
  VeeValidate.ValidationObserver = ValidationObserver;
  VeeValidate.withValidation = withValidation;
  