Update .travis.yml

.travis.yml

@@ -5,8 +5,6 @@ python:
 # command to install dependencies
 install: 
   - "python setup.py -q install"
-  - "pip install pytest-pep8 codecov"
+  - "pip install pytest-pep8 pytest-cov"
 # command to run tests
-script: pytest
-after_success:
-  - codecov
+script: pytest --cov=./