title: Casing of react-intl does not match the underlying filesystem
body: <h3>Current behavior</h3>
  
  <p><code>import { FormattedMessage } from 'react-intl</code>
  throws eslint error </p>
  
  <pre><code>module "&lt;path&gt;/node_modules/react-intl/lib/react-intl"
  Casing of react-intl does not match the underlying filesystem.eslint(import/no-unresolved)
  </code></pre>
  
  <p>This wasn't happening before, though i did a huge update jump from v2 to v4. </p>
  
  <h3>Your Environment</h3>
  
  <p>react-intl  4.1.1.<br>
  react       16.12.0<br>
  npm         6.13.4.<br>
  node        12.7.0.<br>
  babel-plugin-react-intl. 6.0.1</p>