Merge remote-tracking branch 'origin/master'

.gitlab-ci.yml

 image: python:latest
 
-# Change pip's cache directory to be inside the project directory since we can
-# only cache local items.
 variables:
   PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
 
-# Pip's cache doesn't store the python packages
-# https://pip.pypa.io/en/stable/topics/caching/
-#
-# If you want to also cache the installed packages, you have to install
-# them in a virtualenv and cache it as well.
 cache:
   paths:
     - .cache/pip
@@ -29,3 +22,8 @@ test:
   script:
     - pytest --cov
 
+count_lines:
+  tags:
+    - docker
+  script:
+    - git ls-files | wc -l