Fix a bug

src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.shadowsocks"
-    android:versionCode="77"
-    android:versionName="2.3.2">
+    android:versionCode="78"
+    android:versionName="2.3.3">
 
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

src/main/scala/com/github/shadowsocks/ShadowsocksNatService.scala

@@ -221,6 +221,7 @@ class ShadowsocksNatService extends Service with BaseService {
       .setContentTitle(getString(R.string.app_name))
       .setContentText(info)
       .setContentIntent(contentIntent)
+      .setSmallIcon(R.drawable.ic_stat_shadowsocks)
       .addAction(android.R.drawable.ic_menu_close_clear_cancel, getString(R.string.stop),
         actionIntent)