Merge branch '8-fix-license-check' into 'master'

Resolve "Fix license check"

Closes #8

See merge request hifis/hifis-workshops/introduction-to-git-and-gitlab/workshop-material!7

.gitlab-ci.yml

@@ -12,7 +12,7 @@ check_external_links:
     - docker
 
 check_license_infos:
-  image: python:3.6
+  image: python:3.8
   stage: test
   script:
     - pip install reuse