message: add keys to Dropdown test output
diff: @@ -38,18 +38,18 @@ describe('Dropdown.Menu', () => {
  expect(
  render(
  <Dropdown.Menu>
  - <li>1</li>
  - <li>2</li>
  - <li>3</li>
  + <li key="a">1</li>
  + <li key="b">2</li>
  + <li key="c">3</li>
  </Dropdown.Menu>
  )
  ).toMatchSnapshot()
  expect(
  render(
  <Dropdown.Menu>
  - <li>1</li>
  - <li>2</li>
  - <li>3</li>
  + <li key={1}>1</li>
  + <li key={2}>2</li>
  + <li key={3}>3</li>
  </Dropdown.Menu>
  )
  ).toMatchSnapshot()
  