Fix AppVeyor build

Author: Jed Mao

appveyor.yml

@@ -1,12 +1,7 @@
-# http://www.appveyor.com/docs/appveyor-yml
-
 environment:
-  matrix:
-    - nodejs_version: 2
+  nodejs_version: "6"
 
 version: "{build}"
-build: off
-deploy: off
 
 install:
   - ps: Install-Product node $env:nodejs_version
@@ -16,3 +11,6 @@ test_script:
   - node --version
   - npm --version
   - npm test
+
+build: off
+deploy: off