You may use this CentOS 7 repository on Fedora Copr for Vim 8 builds.
By these commands on CentOS 7.
Add this repository:
# curl -L https://copr.fedorainfracloud.org/coprs/mcepl/vim8/repo/epel-7/mcepl-vim8-epel-7.repo -o /etc/yum.repos.d/mcepl-vim8-epel-7.repo
Upgrade Vim to vim 8:
# yum update vim*
After it is successful, your Vim should be version 8.0 now:
# vim --version
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Aug 2 2017 16:29:21)
Included patches: 1-839