remove unused gitlab CI configuration

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

.gitlab-ci.yml

@@ -1,9 +0,0 @@
-before_script:
-  - virtualenv --python=python3.4 env-py3 --clear
-  - source env-py3/bin/activate
-  - pip install -Ur requirements-dev.txt
-
-lint:
-  script:
-    - echo "--zero-exit should be set until only a few messages remain"
-    - prospector --zero-exit