Update version and appcast for 5.0d15.

Appcasts/netnewswire-beta.xml

@@ -6,6 +6,16 @@
         <description>Most recent NetNewsWire changes with links to updates.</description>
         <language>en</language>
 
+<item>
+          <title>NetNewsWire 5.0d15</title>
+            <description><![CDATA[
+            	<p>Sidebar: the drag images are no longer terrible. They’re good — they’re what you expect.</p>
+ 	   					]]></description>
+            <pubDate>Sat, 09 Feb 2019 21:25:00 -0800</pubDate>
+            <enclosure url="https://ranchero.com/downloads/NetNewsWire5.0d15.zip" sparkle:version="1517" sparkle:shortVersionString="5.0d15" length="7208509" type="application/zip" />
+            <sparkle:minimumSystemVersion>10.13</sparkle:minimumSystemVersion>
+        </item>
+
 <item>
           <title>NetNewsWire 5.0d14</title>
             <description><![CDATA[

NetNewsWire/Info.plist

@@ -17,7 +17,7 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>5.0d14</string>
+	<string>5.0d15</string>
 	<key>CFBundleURLTypes</key>
 	<array>
 		<dict>