added broadcast receiver for when android updated

src/Android/PackageReplacedReceiver.cs

@@ -0,0 +1,22 @@
+using Android.App;
+using Android.Content;
+using Bit.App.Abstractions;
+using Bit.App.Utilities;
+using Plugin.Settings.Abstractions;
+using System.Diagnostics;
+using XLabs.Ioc;
+
+namespace Bit.Android
+{
+    [BroadcastReceiver(Name = "com.x8bit.bitwarden.PackageReplacedReceiver", Exported = true)]
+    [IntentFilter(new[] { Intent.ActionMyPackageReplaced })]
+    public class PackageReplacedReceiver : BroadcastReceiver
+    {
+        public override void OnReceive(Context context, Intent intent)
+        {
+            Debug.WriteLine("App updated!");
+            Helpers.PerformUpdateTasks(Resolver.Resolve<ISettings>(), Resolver.Resolve<IAppInfoService>(),
+                Resolver.Resolve<IDatabaseService>());
+        }
+    }
+}