Set up AppVeyor deployment to GitHub Releases

appveyor.yml

@@ -13,3 +13,15 @@ build_script:
 artifacts:
   - path: pawnc-*-windows.zip
     name: Binary package
+
+deploy:
+  description: '<Put release description here>'
+  provider: GitHub
+  auth_token:
+    secure: ++mk9GhXTpN/hdVjIIi/nHpu0gYpDybMJNDPB3lld8r1UyfoPbz08SVGeSS84HjR
+  artifact: /pawnc-.*-windows\.zip/
+  draft: true
+  prerelease: true
+  on:
+    branch: master
+    appveyor_repo_tag: true