Delete Python 3.5 from CI

.gitlab-ci.yml

@@ -30,15 +30,6 @@ stages:
       reports:
         junit: "reports/junit*.xml"
 
-test-py3.5:
-    image: docker.km3net.de/base/python:3.5
-    stage: test
-    script:
-        - *virtualenv_definition
-        - make test
-    <<: *junit_definition
-    allow_failure: true
-
 test-py3.6:
     image: docker.km3net.de/base/python:3.6
     stage: test