don't bother checking diff on lecture 4

Author: afeld

extras/scripts/check_change.sh

@@ -31,22 +31,22 @@ diffable "$POST" "$FINAL"
 
 case "$SOURCE" in
 
-  "lecture_1.ipynb")
+  lecture_1.ipynb)
     # uses sample()
     exit
     ;;
 
-  "lecture_3.ipynb")
+  lecture_3.ipynb)
     # https://github.com/jupyter/nbdime/issues/473#issuecomment-831682930
     exit
     ;;
 
-  "lecture_5.ipynb")
+  lecture_4.ipynb|lecture_5.ipynb)
     # calls APIs with data that could change
     exit
     ;;
 
-  "lecture_5_exercise_solution.ipynb")
+  lecture_5_exercise_solution.ipynb)
     # place_id seems to be unstable
     exit
     ;;