Move coverage.py settings to setup.cfg

Author: rouge8

.coveragerc

@@ -10,3 +10,12 @@ select = E,W,F
 
 [tool:pytest]
 addopts = --strict -ra --tb=short
+
+[coverage:run]
+branch = True
+source =
+    attrs_sqlalchemy,
+    test_attrs_sqlalchemy
+
+[coverage:report]
+show_missing = True