un-inlined comments in flake8 config

Author: TomNicholas

setup.cfg

@@ -33,11 +33,16 @@ exclude =
 
 [flake8]
 ignore =
-    E203 # whitespace before ':' - doesn't work well with black
-    E402 # module level import not at top of file
-    E501 # line too long - let black worry about that
-    E731 # do not assign a lambda expression, use a def
-    W503 # line break before binary operator
+    # whitespace before ':' - doesn't work well with black
+    E203
+    # module level import not at top of file
+    E402
+    # line too long - let black worry about that
+    E501
+    # do not assign a lambda expression, use a def
+    E731
+    # line break before binary operator
+    W503
 exclude=
     .eggs
     doc