docs: update readme with new app link (#1318)

Author: CloudyPadmal

README.md

@@ -1,6 +1,6 @@
 # PSLab Android App
 
-<a href="https://play.google.com/store/apps/details?id=org.fossasia.pslab"><img alt="Get it on Google Play" height="80" src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png"></a>
+<a href="https://play.google.com/store/apps/details?id=org.pslab"><img alt="Get it on Google Play" height="80" src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png"></a>
 <a href="https://f-droid.org/app/org.fossasia.pslab"><img alt="Get it on F-Droid" height="80" src="https://f-droid.org/badge/get-it-on.png"></a>
 
 [![Build Status](https://travis-ci.org/fossasia/pslab-android.svg?branch=development)](https://travis-ci.org/fossasia/pslab-android)