[WIP] ci: measure branch coverage

WHY IS THIS CHANGE NEEDED?:
- branch coverage give additional information re test coverage -- more
  informative for writing tests

HOW DOES THE CHANGE SOLVE THE PROBLEM?:
- add --branch flag, according to https://coverage.readthedocs.io/en/7.0.4/branch.html#how-to-measure-branch-coverage

WHAT SIDE EFFECTS DOES THIS CHANGE HAVE?:
- will change the coverage report and the final percent coverage

REFERENCES:
- issue #46
- merge request !8

.gitlab-ci.yml

@@ -38,7 +38,7 @@ Local Tests:
   stage: tests
   script:
     # - poetry install -vv
-    - poetry run coverage run -m pytest ./tests --ignore ./tests/aliby/network --ignore ./tests/aliby/pipeline
+    - poetry run coverage run -m --branch pytest ./tests --ignore ./tests/aliby/network --ignore ./tests/aliby/pipeline
     - poetry run coverage report -m
     - poetry run coverage xml
   coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'