Add NW.js 0.15.X changelog link to enable downloads of 0.15.X

Author: jyapayne

files/settings.cfg

@@ -307,4 +307,4 @@ linux_64_dir_prefix = 'node-webkit-v{}-linux-x64'
                                  'force_download']"""
 
 [version_info]
-    urls="""['https://raw.githubusercontent.com/nwjs/nw.js/nw14/CHANGELOG.md']"""
+    urls="""['https://raw.githubusercontent.com/nwjs/nw.js/nw15/CHANGELOG.md']"""