title: Can't authenticate Twitter using SimpleAuth
body: <p>Am using <strong>react-native-simple-auth</strong> in my <strong>React-native</strong> Project. 
  <strong>Google-web</strong> is working fine but am facing issue in twitter.
  am getting the following error</p>
  
  <p>There is no class registered to handle twitter requests.' was thrown while invoking authorize on target SimpleAuthWrapper with params (
      twitter,
      37
  )</p>
  
  <p><a href="https://i.stack.imgur.com/zRj4I.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zRj4I.png" alt="enter image description here"></a></p>
  
  <p>am also facing build issue throwing this error</p>
  
  <p><a href="https://i.stack.imgur.com/bc4kx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bc4kx.png" alt="enter image description here"></a></p>
  
  <p>if i uncheck the target membership of SimpleAuth build is successful but twitter oauth is not working.</p>
  
  <p>this is my pod file</p>
  
  <pre><code>platform :ios, '8.0'
  use_frameworks!
  target 'NewsguruRN' do
  pod 'SimpleAuth/GoogleWeb'
  pod 'SimpleAuth/Twitter'
  xcodeproj './ios/Newsguru.xcodeproj'
  end
  </code></pre>
  
  <p>please any one help me with this.</p>