Install module before running build step

Author: qinezh

appveyor.yml

@@ -1,3 +1,4 @@
+clone_folder: c:\ps
 branches:
   only:
     - master
@@ -7,6 +8,11 @@ environment:
     secure: VMFbecLLHzDq/09YDPbcM0VDDSwwgY57vr5GXK6cZZ4Ti/Xs5RZoylzV8MMr1350
 
 before_build:
+  - ps: Install-Module -Name SplitPipeline -Force
+  - ps: Install-Module -Name platyPS -Force
+  - ps: Install-Module -Name Azure -Force
+  - ps: Install-Module -Name AzureRM -Force
+  - ps: Install-Module -Name AzureStack -Force
   - ps: Install-Product node $env:nodejs_version
   - git config --global credential.helper store
   - ps: ac "$env:USERPROFILE\.git-credentials" "https://$($env:github_access_token):[email protected]`n"