Avoid pytest-cov involvement:

https://dev.gentoo.org/~mgorny/python-guide/pytest.html#avoiding-dependencies-on-other-pytest-plugins

Signed-Off-By: John Helmert III <ajak@gentoo.org>

diff --git a/setup.cfg b/setup.cfg
index 2428e44..117f237 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,14 +1,6 @@
 [wheel]
 universal = 1
 
-[tool:pytest]
-addopts = 
-	--tb=short
-	--cov-config .coveragerc
-	--cov=vdirsyncer
-	--cov-report=term-missing
-	--no-cov-on-fail
-
 [flake8]
 application-import-names = tests,vdirsyncer
 extend-ignore =