tracker bug as per https://fedoraproject.org/wiki/Packaging:Guidelines#Architecture_Build_Failures
conu has broken dependencies in the rawhide tree:
python3-conu-0.2.0-1.fc28.noarch requires docker
python3-conu-0.2.0-1.fc28.noarch requires source-to-image
python2-conu-0.2.0-1.fc28.noarch requires docker
Since there is no docker and no source-to-image package on this architecture, conu can't be built on ppc64. As a solution I have excluded this architecture.
This bug appears to have been reported against 'rawhide' during the Fedora 29 development cycle.
Changing version to '29'.