add --cov to builds

.travis.yml

@@ -9,7 +9,7 @@ install:
   - pip install pipenv
   - pipenv install --dev
 
-script: pipenv run python -m pytest
+script: pipenv run python -m pytest --cov=./
 
 after_success:
   - codecov

appveyor.yml

@@ -19,7 +19,7 @@ test_script:
   # Note that you must use the environment variable %PYTHON% to refer to
   # the interpreter you're using - Appveyor does not do anything special
   # to put the Python version you want to use on PATH.
-  - "pipenv run python -m pytest"
+  - "pipenv run python -m pytest --cov=./"
 
 after_succss:
   - codecov