android: make app movable to SD card

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <manifest
     xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.jitsi.meet">
+    package="org.jitsi.meet"
+    android:installLocation="auto">
   <application
       android:allowBackup="true"
       android:icon="@mipmap/ic_launcher"