message: feat: validation observer slot-scope is optional
diff: import { createRenderless } from '../utils/vnode';
  -import { isCallable, values, warn } from '../utils';
  +import { isCallable, values } from '../utils';
  const flagMergingStrategy = {
  pristine: 'every',
  @@ -92,10 +92,6 @@ export const ValidationObserver = {
  render (h) {
  let slots = this.$scopedSlots.default;
  if (!isCallable(slots)) {
  - if (process.env.NODE_ENV !== 'production') {
  - warn('ValidationObserver expects a scoped slot. Did you forget to add "slot-scope" to your slot?');
  - }
  -
  return createRenderless(h, this.$slots.default);
  }
  