Shello example missing glyphs

[maxwell8888]

I'm on Ubuntu 20.04 and running when running the shello example, some glyphs are missing. See attached screen shot.

Note: As far as I understand this would be due to one of the example's dependencies rather than glazier itself but I'm not sure where might be a better place to create an issue.

[waywardmonkeys]

This should be fixed now, I think, with the update to Vello.