Thanks! I will have this fixed in the next release.
Here is a workaround for now:
curl -sSL https://install.pi-hole.net | sed s/fedora/fedberry/g | bash
If you would prefer to read the code prior to installation:
curl -sSL https://install.pi-hole.net | sed s/fedora/fedberry/g > fedberry_install.sh
read... then run the installer:
bash fedberry_install.sh
Cheers!
EDIT: update workaround (2018-08-25)