Bookmark: Implement stubbed methods.

Change-Id: I2f159cb7ea068f7d1fb26680b89aa9d3be1f46c2
diff --git a/src/main/java/eu/mulk/mulkcms2/benki/bookmarks/Bookmark.java b/src/main/java/eu/mulk/mulkcms2/benki/bookmarks/Bookmark.java
index 6f5ffc8..8d0b2f8 100644
--- a/src/main/java/eu/mulk/mulkcms2/benki/bookmarks/Bookmark.java
+++ b/src/main/java/eu/mulk/mulkcms2/benki/bookmarks/Bookmark.java
@@ -42,13 +42,13 @@
   @CheckForNull
   @Override
   public String getUri() {
-    return null;
+    return uri;
   }
 
   @CheckForNull
   @Override
   public String getTitle() {
-    return null;
+    return title;
   }
 
   @Override