0.1.6 seems to work on EL 7.3. The motivation for this update is that bublewrap is requirement for flatpak. Thanks.
Actually 0.1.5 and 0.1.6 fail on EL 7.3 with this message:
Unexpected capabilities but not setuid, old file caps config?
I think it's better to use the version of bubblewrap included with flatpak for the EL 7 flatpak package. Closing bug.