docs/plugins.rst: use --cov with addopts

Without `--cov` pytest-cov will not track coverage at all. [ci skip]
pytest-dev · Jan 7, 2019 · 452ecfd · 452ecfd
1 parent 234fb20
commit 452ecfd
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/docs/plugins.rst b/docs/plugins.rst
@@ -21,5 +21,4 @@ Alternatively you can have this in ``tox.ini`` (if you're using `Tox <https://to
 And in ``pytest.ini`` / ``tox.ini`` / ``setup.cfg``::
 
     [tool:pytest]
-    addopts =
-        --cov-append
+    addopts = --cov --cov-append