message: Use webhook URL that should be available from anywhere
  (with working Internet connection)
diff: @@ -23,7 +23,7 @@ describe('webhook', () => {
  })
  it('submits POST with payload to existing URL', () => {
  - expect(() => webhook.notify(challenge, 'http://localhost')).to.not.throw()
  + expect(() => webhook.notify(challenge, 'https://webhook.site/f69013b6-c475-46ed-973f-aa07e5e573a3')).to.not.throw()
  })
  })
  })
  