Changed npm scripts in appveyor to yarn scripts.

.appveyor.yml

@@ -24,27 +24,35 @@ artifacts:
 install:
 - ps: Install-Product node $env:nodejs_version $env:platform
 - set PATH=%APPDATA%\npm;%PATH%
-- npm install
+# - npm install
+- yarn
 
 before_test:
-- npm install -g @angular/cli
-- npm install -g karma
-- npm install -g electron-forge
-- npm install
+- yarn global add @angular/cli
+- yarn global add karma
+- yarn global add electron-forge
+- yarn
+# - npm install -g @angular/cli
+# - npm install -g karma
+# - npm install -g electron-forge
+# - npm install
 - ng build
 
 test_script:
 - node --version
-- npm --version
-- npm run test-build
+# - npm --version
+# - npm run test-build
+- yarn --version
+- yarn text-build
 
 build: off # We do not intend to build using MS Build
 
 # Run build in after_test to generate artifacts
 after_test:
 - ps: (Get-Content .\dist\index.html) | ForEach-Object { $_ -replace '<base href="/">', '<base href="./">' } | Set-Content .\dist\index.html
 # - npm run make
-- npm run dist-electron
+- yarn dist-electron
+# - npm run dist-electron
 
 deploy:
   description: ''