flake-8 allow use of assertRaises(Exception)

Author: jkowalleck

.flake8

@@ -5,6 +5,8 @@ show-source  = True
 ignore =
     # ignore `self`, `cls` markers of flake8-annotations>=2.0
     ANN101,ANN102
+    # allow use of `assertRaises(Exception)`
+    B017
 
 exclude = .git,__pycache__,_OLD,_TEST,build,dist,.tox,*_cache,.eggs,.venv,venv
     setup.py
@@ -15,4 +17,3 @@ max-complexity = 5
 
 # allow up to 119 characters as this is the width of GitHub code review
 max-line-length = 120
-