build: use faster AppVeyor Node.js switching

Author: dougwilson

appveyor.yml

@@ -8,7 +8,7 @@ matrix:
     - nodejs_version: "0.11"
   fast_finish: true
 install:
-  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)
+  - ps: Install-Product node $env:nodejs_version
   - npm install
 build: off
 test_script: