[fix] #98 fix gitlab-ci and MakeFile bugs

Remove useless coverage package in dev requirements

.gitlab-ci.yml

@@ -63,6 +63,7 @@ test:
   <<: *changes
   stage: test
   script:
+    - pip install coverage
     - pip install -r requirements.txt
     - coverage run -m unittest
     - coverage report -m

Makefile

@@ -7,7 +7,7 @@ docs:
 
 # run tests
 tests:
-	python3 -m   ${TESTS_FILTER}
+	python3 -m unittest ${TESTS_FILTER}
 
 # check
 check: mypy pylint check-format

requirements_dev.txt

-coveralls
 mypy
 pylint
 black