Use pytest-cov instead of coverage

Author: bgyori

setup.py

@@ -37,6 +37,6 @@
       ],
       packages=find_packages(),
       install_requires=['lxml', 'requests', 'tqdm'],
-      tests_require=['pytest', 'tox'],
+      tests_require=['pytest', 'pytest-cov', 'tox'],
       keywords=['biology', 'pathway']
       )

tox.ini

@@ -10,9 +10,9 @@ envlist =
     py
 
 [testenv]
-commands = coverage run -p -m pytest --durations=20 {posargs:pybiopax/tests}
+commands = pytest --durations=20 --cov=pybiopax {posargs:pybiopax/tests}
 deps =
-    coverage
+    pytest-cov
     pytest
 
 [testenv:pyroma]