message: chore(bitgo): fix unit test
  latest ts-node has issues with this test's regex
  Ticket:
diff: import 'should';
  +const assert = require('assert');
  import { BitGoJsError, NodeEnvironmentError } from '../../../src/errors';
  describe('Error handling', () => {
  it('should capture stack trace', function namedFunc() {
  - const bitGoJsError = new BitGoJsError();
  - bitGoJsError.stack!.should.match(/BitGoJsError:/);
  - bitGoJsError.stack!.should.match(/at Context\.namedFunc/);
  -
  + const { stack } = new BitGoJsError();
  + assert.match(stack, /BitGoJsError/);
  + assert.match(stack, /at Context\.namedFunc/);
  (new NodeEnvironmentError()).stack!.should.match(/NodeEnvironmentError:/);
  });
  });
  