Try to run tests on Windows

Useful link: https://help.appveyor.com/discussions/questions/22219-installing-a-specifc-node-version-on-both-windows-and-linux-builds

Author: gnclmorais

appveyor.yml

@@ -9,11 +9,15 @@ environment:
   matrix:
     - nodejs_version: "8"
     - nodejs_version: "10"
+image:
+  - Ubuntu
+  - Visual Studio 2017
 
 # Install scripts. (runs after repo cloning)
 install:
-  - ps: Install-Product node $env:nodejs_version
-  - appveyor-retry yarn --frozen-lockfile --non-interactive
+  - cmd: powershell Install-Product node $env:nodejs_version
+  - sh: nvm install $nodejs_version
+  - yarn --frozen-lockfile --non-interactive
 
 cache:
   - '%LOCALAPPDATA%\Yarn'