Update README.md

Author: jdnichollsc

README.md

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 <h1 align="center">InAppBrowser for NativeScript</h1>
+<h3 align="center">Provides access to the system's web browser and supports handling redirects</h3>
 <h4 align="center"><a href="https://developer.chrome.com/multidevice/android/customtabs#whatarethey">Chrome Custom Tabs</a> for Android & <a href="https://developer.apple.com/documentation/safariservices">SafariServices</a>/<a href="https://developer.apple.com/documentation/authenticationservices">AuthenticationServices</a> for iOS.</h4>
 
 <p align="center">