Add new flake8 plugins and update errors to look for

setup.cfg

@@ -5,8 +5,33 @@ test=pytest
 universal=1
 
 [flake8]
-exclude = setup.py,docs/*,examples/*,tests,graphene_django/debug/sql/*
+exclude = docs,graphene_django/debug/sql/*,migrations
 max-line-length = 120
+select =
+	# Dictionary key repeated
+	F601,
+	# Ensure use of ==/!= to compare with str, bytes and int literals
+	F632,
+	# Redefinition of unused name
+	F811,
+	# Using an undefined variable
+	F821,
+	# Defining an undefined variable in __all__
+	F822,
+	# Using a variable before it is assigned
+	F823,
+	# Duplicate argument in function declaration
+	F831,
+	# Black would format this line
+	BLK,
+	# Do not use bare except
+	B001,
+	# Don't allow ++n. You probably meant n += 1
+	B002,
+	# Do not use mutable structures for argument defaults
+	B006,
+	# Do not perform calls in argument defaults
+	B008
 
 [coverage:run]
 omit = */tests/*

setup.py

@@ -25,7 +25,12 @@ tests_require = [
 ] + rest_framework_require
 
 
-dev_requires = ["black==19.3b0", "flake8==3.7.7"] + tests_require
+dev_requires = [
+    "black==19.3b0",
+    "flake8==3.7.7",
+    "flake8-black==0.1.0",
+    "flake8-bugbear==19.3.0",
+] + tests_require
 
 setup(
     name="graphene-django",