Changing to 'main' branch from 'master'

[TomSweeneyRedHat]

@mairin any plans to convert this from the master branch to main? It's easy enough to do now via the GitHub interface, the only downside is any links to your site will fail until they too convert from master to main.

[mairin]

@TomSweeneyRedHat eek thanks for pointing this out! I think I just fixed it - let me know if it didn't work!

[TomSweeneyRedHat]

@mairin np, we're doing the conversion ourselves too. This LGTM, but a note if you get any questions about bad links. Folks that used links like:

https://github.com/mairin/coloringbook-container-commandos/blob/master/Web.pdf

will have to convert the master to main in the link on their site ala:

https://github.com/mairin/coloringbook-container-commandos/blob/main/Web.pdf