Update appveyor.yml

appveyor.yml

@@ -6,6 +6,7 @@ environment:
 install:
   # Get the latest stable version of Node.js or io.js
   - ps: Install-Product node $env:nodejs_version
+  - ps: Install-Product yarn
   # install modules
   - npm install
 
@@ -14,8 +15,8 @@ test_script:
   # Output useful info for debugging.
   - node --version
   - npm --version
-  # run tests
-  - npm test
-
+  
 # Don't actually build.
-build: off
+build:
+  - ps: cd ElectronClient\app
+  - yarn dist