Attempt to add secure vars

Author: jspringe

.appveyor.yml

@@ -51,8 +51,12 @@ install:
   - appveyor DownloadFile https://curl.haxx.se/ca/cacert.pem
 
   - cd c:\projects\wmi-scripting
+
+  - git config --global user.email "%GIT_EMAIL%"
+  - git config --global user.name "%GIT_USER%"
   - yarn install
   - yarn docs:deploy:windows:ci
+
   - IF NOT EXIST composer.phar (appveyor DownloadFile https://github.com/composer/composer/releases/download/1.9.0/composer.phar)
   - php composer.phar self-update
   - php composer.phar update --no-interaction --prefer-dist --no-suggest --ansi --no-progress