clarified how-to
python -m pip install --upgrade pip
python -m pip install --upgrade setuptools coverage
-> coverage run --source=btclib setup.py test
-> coverage report -m
-> coverage html
+coverage run --source=btclib setup.py test
+coverage report -m
+coverage html
```
-then seen the htmlcov/index.html report in a browser
+if you prefer to see the report in a webpage, also add:
+
+```shell
+coverage html
+```
+
+then see htmlcov/index.html
