add some :elevations to article fragment

org.fox.ttrss/src/main/AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.fox.ttrss"
-    android:versionCode="280"
-    android:versionName="1.72" >
+    android:versionCode="281"
+    android:versionName="1.73" >
 
     <uses-sdk
         android:minSdkVersion="9"

org.fox.ttrss/src/main/res/layout/article_fragment.xml

@@ -17,6 +17,7 @@
 
             <LinearLayout
                 android:padding="8dp"
+                android:elevation="6dp"
                 android:id="@+id/article_header"
                 android:background="?articleHeader"
                 android:layout_width="match_parent"
@@ -82,6 +83,7 @@
             </LinearLayout>
 
             <TextView
+                android:elevation="2dp"
                 android:id="@+id/note"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"