title: Changing fontFamily in native base library of react native does not work
body: <p>I am using native-base library in react native. I have done following steps to change font but it does not work:</p>
  
  <ol>
  <li><p>I pasted <code>myfont.ttf</code> in this directory: </p>
  
  <p><code>node_modules/native-base/Fonts</code></p></li>
  <li><p>I went to the following directory:</p>
  
  <p><code>node_modules/native-base/src/theme/variables/...</code></p>
  
  <p>and changed all font families into <code>myFont.ttf</code> in all three files (commonColor.js, material.js and platform.js)</p></li>
  </ol>
  
  <p>Please help me in this issue.</p>