title: Use of unresolved identifier 'STPCardParams' in swift 4.0
body: <p>I am trying to integrate Stripe in my application. But when I am trying to implement Custom Card form, it's giving me this error - <code>Use of unresolved identifier 'STPCardParams'</code></p>
  
  <p>Here is the following details:</p>
  
  <p>Deployment target: 10.0</p>
  
  <p>Stripe version: 11.4.0</p>
  
  <p>In AppDelegate:
  <a href="https://i.stack.imgur.com/X2I2Z.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/X2I2Z.png" alt="enter image description here"></a></p>
  
  <p>Now having this issue:
  <a href="https://i.stack.imgur.com/GXgQN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GXgQN.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/zFFt3.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zFFt3.gif" alt="enter image description here"></a></p>
  
  <p>Any Solution?</p>