add item divider via decorator

src/main/java/com/owncloud/android/ui/activity/NotificationsActivity.java

@@ -24,6 +24,7 @@ package com.owncloud.android.ui.activity;
 
 import android.accounts.Account;
 import android.os.Bundle;
+import android.support.v7.widget.DividerItemDecoration;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.MenuItem;
@@ -116,7 +117,13 @@ public class NotificationsActivity extends FileActivity {
 
         adapter = new NotificationListAdapter(this);
         recyclerView.setAdapter(adapter);
-        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+
+        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
+        DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
+                layoutManager.getOrientation());
+
+        recyclerView.setLayoutManager(layoutManager);
+        recyclerView.addItemDecoration(dividerItemDecoration);
 
         fetchAndSetData();
     }