Remove US language code from App Store link (#212)

Remove US language code from App Store link in README.md

Co-authored-by: Willy <[email protected]>

README.md

@@ -19,7 +19,7 @@ Wallet for Peercoin and Peercoin Testnet using Electrumx as backend.
      alt="Get it on Google Play" height="80"></a>
 </p>
 <p align="center">
-     <a href="https://apps.apple.com/us/app/peercoin-wallet/id1571755170?itsct=apps_box_badge&amp;itscg=30200" style="display: inline-block; overflow: hidden; border-radius: 13px; width: 250px; height: 83px;"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?size=250x83&amp;releaseDate=1626912000&h=8e86ea0b88a4e8559b76592c43b3fe60" alt="Download on the App Store" style="border-radius: 13px; width: 250px; height: 83px;"></a>
+     <a href="https://apps.apple.com/app/peercoin-wallet/id1571755170?itsct=apps_box_badge&amp;itscg=30200" style="display: inline-block; overflow: hidden; border-radius: 13px; width: 250px; height: 83px;"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?size=250x83&amp;releaseDate=1626912000&h=8e86ea0b88a4e8559b76592c43b3fe60" alt="Download on the App Store" style="border-radius: 13px; width: 250px; height: 83px;"></a>
 </p> 
 
 You can also sign up for our open beta testing here: