Add flake8/coverage configs

Author: ZipFile

setup.cfg

@@ -2,4 +2,12 @@
 test=pytest
 
 [flake8]
-application_import_names = getdents
+application-import-names = getdents
+exclude = env,build,dist,.eggs,.git,__pycache__
+import-order-style = cryptography
+max-line-length = 79
+
+[coverage:run]
+branch = True
+omit = getdents/__main__.py
+source = getdents