Applied matrix build for the multiple platforms.

azure-pipelines.yml

@@ -3,21 +3,24 @@
 # Add steps that install rails, analyze code, save build artifacts, deploy, and more:
 # https://docs.microsoft.com/azure/devops/pipelines/languages/ruby
 
-trigger:
-- master
-
-pool:
-  vmImage: 'Ubuntu-16.04'
+strategy:
+  matrix:
+    linux:
+      imageName: 'ubuntu-16.04'
+    mac:
+      imageName: 'macos-10.13'
+    windows:
+      imageName: 'vs2017-win2016'
 
 steps:
 - task: UseRubyVersion@0
   inputs:
-    versionSpec: '>= 2.5'
+    versionSpec: '>= 2.0'
 
 - script: |
     gem install bundler
     bundle install --retry=3 --jobs=4
   displayName: 'bundle install'
 
-- script: bundle exec rake
-  displayName: 'bundle exec rake'
+- script: ruby -Ilib exe/rake
+  displayName: 'ruby -Ilib exe/rake'