Proguard fix: include notification settings fragment.

    #proguaaaaaaaaard

Change-Id: Ifdc7370f93dc4bbdfedc7be35534d5f2ccda3bad
diff --git a/proguard.flags b/proguard.flags
index 0805d68..8a6c2cb 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -12,6 +12,7 @@
 -keep class com.android.settings.accounts.*
 -keep class com.android.settings.fuelgauge.*
 -keep class com.android.settings.users.*
+-keep class com.android.settings.NotificationStation
 
 # Keep click responders
 -keepclassmembers class com.android.settings.inputmethod.UserDictionaryAddWordActivity {