pytest doesn't provide --cov by default

TurnrDev · web-flow · commit 1057040284b4 · 2020-10-11T11:11:52.000+01:00
Update the docs to explain how to use
diff --git a/README.md b/README.md
@@ -34,6 +34,7 @@ coverage run tests.py
 ```
 #### pytest
 ```
+pip install pytest-cov
 pytest --cov=./
 ```
 #### nosetests
@@ -75,4 +76,4 @@ Cobertura reports can expire - Codecov will reject reports that are older than 1
 
 
 ## License
-[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fcodecov%2Fexample-python.svg?type=large)](https://app.fossa.com/projects/git%2Bgithub.com%2Fcodecov%2Fexample-python?ref=badge_large)
+[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fcodecov%2Fexample-python.svg?type=large)](https://app.fossa.com/projects/git%2Bgithub.com%2Fcodecov%2Fexample-python?ref=badge_large)
