👍 Add name property to type predicate functions

[lambdalisue]

Before

error: Uncaught AssertError: Expected a value that satisfies the predicate anonymous predicate, got object: {
  "tile": "Awesome article",
  "body": "This is an awesome article",
  "refs": [
    {
      "name": "Deno",
      "url": "https://deno.land/"
    },
    "https://github.com"
  ]
}
    throw new AssertError(
          ^
    at assert (file:///Users/alisue/ghq/github.com/lambdalisue/deno-unknownutil/util.ts:85:11)
    at file:///Users/alisue/ghq/github.com/lambdalisue/test.ts:22:1

After

error: Uncaught AssertError: Expected a value that satisfies the predicate isObjectOf({
  title: isString,
  body: isString,
  refs: isArrayOf(isOneOf([
    isString,
    isObjectOf({
      name: isString,
      url: isString
    })
  ]))
}), got object: {
  "tile": "Awesome article",
  "body": "This is an awesome article",
  "refs": [
    {
      "name": "Deno",
      "url": "https://deno.land/"
    },
    "https://github.com"
  ]
}
    throw new AssertError(
          ^
    at assert (file:///Users/alisue/ghq/github.com/lambdalisue/deno-unknownutil/util.ts:85:11)
    at file:///Users/alisue/ghq/github.com/lambdalisue/test.ts:22:1