Resolve "move to gitlab and Automize pdfenize markdown document"

It is correct that the pipeline exits with warnings due to one linting error that seems to be a bug.

Closes #10 (closed)

.gitlab-ci.yml

@@ -12,6 +12,7 @@ tests:
   image: node:10
   before_script:
     - npm install
+    - npx -v
   script:
     - npx markdownlint -o markdownlint-report.txt rdd-technical-reference.md
   artifacts: