try unpublishing before publish [publish binary]

appveyor.yml

@@ -58,7 +58,7 @@ install:
   - node-pre-gyp package %TOOLSET_ARGS%
   # make commit message env var shorter
   - SET CM=%APPVEYOR_REPO_COMMIT_MESSAGE%
-  - if not "%CM%" == "%CM:[publish binary]=%" node-pre-gyp --msvs_version=2013 publish --loglevel=verbose %TOOLSET_ARGS%
+  - if not "%CM%" == "%CM:[publish binary]=%" node-pre-gyp --msvs_version=2013 unpublish publish --loglevel=verbose %TOOLSET_ARGS%
   - if "%msvs_toolset%" == "12" call scripts\build_for_node_webkit.cmd %PLATFORM%
 
 build: OFF

package.json

@@ -44,7 +44,7 @@
     ],
     "devDependencies": {
         "mocha": "1.x",
-        "aws-sdk": "~2.0.4"
+        "aws-sdk": "~2.0.25"
     },
     "engines": {
         "node": ">= 0.10.0 < 0.11.0 || >= 0.11.13 < 0.13.0"