Fixing Launcher3Quickstep build, broken due to SDK changes

Change-Id: I7228c036e023f94d3f47b303c7e7b4395bc8a1b7
diff --git a/quickstep/AndroidManifest.xml b/quickstep/AndroidManifest.xml
index bab2cd7..c76ad83 100644
--- a/quickstep/AndroidManifest.xml
+++ b/quickstep/AndroidManifest.xml
@@ -21,6 +21,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.launcher3" >
 
+    <uses-sdk android:targetSdkVersion="28" android:minSdkVersion="28"/>
     <uses-permission android:name="android.permission.CONTROL_REMOTE_APP_TRANSITION_ANIMATIONS" />
     <application
         android:backupAgent="com.android.launcher3.LauncherBackupAgent"