update notebook format to 4.5

Author: ramalho

.gitignore

@@ -1,12 +1,8 @@
+
 *.sublime-project
 *.sublime-workspace
-concurrency/flags/img/*.gif
-concurrency/charfinder/charfinder_index.pickle
-18-asyncio/charfinder/charfinder_index.pickle
-metaprog/oscon-schedule/data/schedule?_db
-concurrency/wikipedia/fixture/docroot/
-17-futures/countries/flags/
-attic/futures/countries/flags/
+.ipynb_checkpoints/
+.py311/
 
 # Byte-compiled / optimized / DLL files
 __pycache__/