update setup.cfg section for pytest to 3.0.2 format

tony · tony · commit c4fbfc117cab · 2016-09-13T11:48:11.000-05:00
diff --git a/setup.cfg b/setup.cfg
@@ -2,5 +2,5 @@
 exclude = .*/,.tox,*.egg,tmuxp/_compat.py,tmuxp/__*__.py,
 select = E,W,F,N
 
-[pytest]
+[tool:pytest]
 addopts = --rerun 5
