Merge pull request #286 from interpretml/gaugup-patch-2

add 'packaging' to requirement-linting.txt to fix broken linting gate

Author: gaugup

requirements-linting.txt

@@ -4,5 +4,6 @@ flake8-blind-except==0.1.1
 flake8-breakpoint
 flake8-builtins==1.5.3
 flake8-logging-format==0.6.0
-flake8-nb==0.3.0
+flake8-nb==0.4.0
 isort
+packaging