👍 Add PredicateType<P> to infer T of Predicate<T>

[lambdalisue]

Now users can infer T from Predicate<T> so that they don't need to define type definition twice

Before

const isArticle = is.ObjectOf({
  title: is.String,
  body: is.String,
  refs: is.ArrayOf(is.OneOf([
    is.String,
    is.ObjectOf({
      name: is.String,
      url: is.String,
    }),
  ])),
});

type Article = {
  title: string;
  body: string;
  refs: (string | {
    name: string;
    url: string;
  })[];
};

After

const isArticle = is.ObjectOf({
  title: is.String,
  body: is.String,
  refs: is.ArrayOf(is.OneOf([
    is.String,
    is.ObjectOf({
      name: is.String,
      url: is.String,
    }),
  ])),
});

type Article = PredicateType<typeof isArticle>;