Update updater.inc path

Bitbucket has stopped supporting Mercurial repositories, making the [original repository](https://bitbucket.org/GoD_Tony/updater/) unavailable.

More info: https://bitbucket.org/blog/sunsetting-mercurial-support-in-bitbucket

Author: Groruk

Diff for: appveyor.yml

@@ -14,7 +14,7 @@ install:
   - ps: Invoke-WebRequest "https://www.sourcemod.net/latest.php?version=$env:SOURCEMOD&os=windows" -OutFile "sourcemod-$env:SOURCEMOD-windows.zip"
   - ps: Expand-Archive -Path "sourcemod-$env:SOURCEMOD-windows.zip" -DestinationPath "game"
   - ps: cd game\addons\sourcemod\scripting\include\
-  - ps: Invoke-WebRequest "https://bitbucket.org/GoD_Tony/updater/raw/53ebb3e27e5a43bc46dc52dc0de76ac2fb48cd9e/include/updater.inc" -OutFile "updater.inc"
+  - ps: Invoke-WebRequest "https://raw.githubusercontent.com/sbpp/Updater-include-mirror/master/scripting/include/updater.inc" -OutFile "updater.inc"
   - ps: cd ..
 
 build: off
@@ -38,4 +38,4 @@ artifacts:
     name: sourcebans-pp-zip
 
   - path: sourcebans-pp.plugin-only.tar.gz
-    name: sourcebans-pp-tar.gz
+    name: sourcebans-pp-tar.gz