Merge branch 'main' of https://github.com/whmsft/whirledit

Update update.py

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v3.5

an image previewer (VERY EXPERIMENTAL!)
raise error on UnicodeDecodeError
updated button for syntax change
**bugfixes

jump to v3.4 (Tricky Trick)

Update main.py

Update README.md

Delete sidebar.edit.png

Update README.md

Update python-app.yml