add cov source

Author: Ahmad-Zaki

.travis.yml

@@ -5,6 +5,6 @@ install:
 - pip install -e .
 - pip install pytest-cov codecov   # Install packages for code coverage report
 script:
-- pytest --cov=src tests
+- pytest --cov=Implementations tests
 after_success:
 - codecov   # uploads report to codecov.io