message: test/bitgo: use 'crypto'
  No reason to use third-party dependency here
diff: /* global describe, it */
  const assert = require('assert')
  -var randombytes = require('randombytes')
  +const crypto = require('crypto')
  const BigInteger = require('bigi')
  @@ -42,7 +42,7 @@ describe('privateKeyBufferFromECPair', function () {
  describe('privateKeyBufferToECPair', function () {
  it('constructs an ECPair from a random private key buffer', function () {
  - var prvKeyBuffer = randombytes(32)
  + var prvKeyBuffer = crypto.randomBytes(32)
  var ecPair = privateKeyBufferToECPair(prvKeyBuffer)
  var ecPairPrvBuffer = privateKeyBufferFromECPair(ecPair)
  assert.strictEqual(Buffer.compare(ecPairPrvBuffer, prvKeyBuffer), 0)
  