title: How can I get version of react-native at runtime?
body: <p>The API of React Native is changing fast, as a module developer, I have to do some adaptive work for better compatibility.</p>
  
  <p>How can I do something like that in a RN module (js/objc/java):</p>
  
  <pre><code>if (RN_VERSION === ENV.RN_0_11) {
    callNewApi(xxx);
  } else {
    callOldApi(xxx);
  }
  </code></pre>