title: how to getrid of ionic v1 deprecation error issue
body: <p>I am getting ionic v1 deprecation error issue. so it's not working </p>
  
  <pre><code>ionic build ios
  ionic emulate android
  </code></pre>
  
  <p>Those basic commands are not working. How to overcome this issue.</p>
  
  <p>Note: I have ionic v1 application so with do huge modification how to upgrade or use older version .</p>
  
  <p><a href="https://i.stack.imgur.com/WgGkJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WgGkJ.png" alt="enter image description here"></a></p>
  
  <p>Thanks in Advance</p>