Update flake8/pytest sections in setup.cfg.

Author: ktlim

setup.cfg

@@ -3,12 +3,10 @@ max-line-length = 110
 max-doc-length = 79
 ignore = E133, E226, E228, N802, N803, N806, N812, N813, N815, N816, W503
 exclude =
-  bin,
-  doc/conf.py,
-  **/*/__init__.py,
-  **/*/version.py,
-  tests/.tests
+	bin,
+	doc/conf.py,
+	**/*/__init__.py,
+	**/*/version.py,
+	tests/.tests
 
 [tool:pytest]
-addopts = --flake8
-flake8-ignore = E133 E226 E228 N802 N803 N806 N812 N813 N815 N816 W503