add coverage report to travis ci

.travis.yml

@@ -4,5 +4,6 @@ script:
   - python setup.py install
   - flake8 --max-line-length=120 --ignore=D101,D104,D212,D200,E203,W293,D412,W503 mkdocs_with_confluence/
   - black --check --line-length=120 mkdocs_with_confluence/
+  - pytest --cov=mkdocs_with_confluence/
 after_success:
   - bash <(curl -s https://codecov.io/bash)

requirements_dev.txt

@@ -1,2 +1,3 @@
 black
 flake8
+pytest-cov