feat: add support for BigInt as a primative value

[rollingversions[bot]]

Change Log for funtypes (5.0.3 → 5.1.0)

New Features

• Add support for BigInt as a primative value

  import * as t from 'funtypes';
  
  const MySchema = t.Object({
  myInteger: t.BigInt,
  });

  ✅ Valid:

  { myInteger: 10n }

  ✅ Valid:

  { myInteger: BigInt('10') }

  🚨 Invalid:

  { myInteger: 10 }

  🚨 Invalid:

  { myInteger: '10' }

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[ForbesLindesay]

Fixes #53