add git diff after pip-compile

.gitlab-ci.yml

@@ -77,6 +77,7 @@ verify_existing_requirements:
   script:
     - pip-compile requirements.in
     - pip-compile requirements_dev.in
+    - git diff
     # checking difference between existing requirements and the newly generated one
     # and using the number of lines as exit status code
     - exit $(git status -s | grep -e "^ M " | wc -l)