This small script replaces the default icon for atom and atom beta on MacOS. No symlinks, no special stuff. Should just work and if it doesn't file a PR.
It grew out of frustration using the atom icon replacement project which doesn't support Atom Beta and for some reason just messes things up for me.
PR for Windows and Linux welcome - reviews will be opinionated.
$ ./install.sh
Note: you'll have to run this every time atom updates since the updated bundle contains the old icon.
Icon from Jonathan Simcoe, licensed under BSD-2 which this project also adopts.