edit pre-commit hooks

.pre-commit-config.yaml

@@ -22,4 +22,9 @@ repos:
   rev: v1.16.1
   hooks:
     - id: mypy
-      exclude: '^(?!src).*'
+      exclude: '^(?!src).*'
+
+- repo: https://github.com/kynan/nbstripout
+  rev: 0.8.1
+  hooks:
+    - id: nbstripout