binder link broken

[ianhi]

Describe the issue

https://mybinder.org/v2/gh/matplotlib/ipympl/stable?urlpath=retro/notebooks/examples/ipympl.ipynb

leads to a 404 for me. If i swap retro for lab and remove the notebooks then it works: https://mybinder.org/v2/gh/matplotlib/ipympl/stable?urlpath=retro/examples/ipympl.ipynb

[martinRenou]

Thanks! Might have been a wrong copy paste

[martinRenou]

Actually, it's the other way around for me...

https://mybinder.org/v2/gh/matplotlib/ipympl/stable?urlpath=retro/notebooks/examples/ipympl.ipynb works

https://mybinder.org/v2/gh/matplotlib/ipympl/stable?urlpath=retro/examples/ipympl.ipynb leads to 404

I just updated the stable branch that was a bit behind. Maybe that was it?