So, change:
[mratwork-ius-stable]
name=MRatWork - IUS Community Packages for EL $releasever (stable)
#baseurl=http://dl.iuscommunity.org/pub/ius/stable/CentOS/$releasever/$basearch
baseurl=https://repo.ius.io/$releasever/$basearch
#mirrorlist=http://mirrors.iuscommunity.org/mirrorlist/?repo=ius-centos$releasever&arch=$basearch&protocol=http
enabled=1
gpgcheck=0
exclude=mysql5* mysql56*
[mratwork-ius-archive]
name=MRatWork - IUS Community Packages for EL $releasever (archive)
#baseurl=http://dl.iuscommunity.org/pub/ius/archive/CentOS/$releasever/$basearch
baseurl=https://repo.ius.io/archive/$releasever/$basearch
#mirrorlist=http://mirrors.iuscommunity.org/mirrorlist?repo=ius-centos$releasever-archive&arch=$basearch&protocol=http
enabled=1
gpgcheck=0
exclude=mysql5* mysql56*
[mratwork-ius-testing]
name=MRatWork - IUS Community Packages for EL $releasever (testing)
#baseurl=http://dl.iuscommunity.org/pub/ius/testing/CentOS/$releasever/$basearch
baseurl=https://repo.ius.io/testing/$releasever/$basearch
#mirrorlist=http://mirrors.iuscommunity.org/mirrorlist?repo=ius-centos$releasever-testing&arch=$basearch&protocol=http
enabled=1
gpgcheck=0
exclude=mysql5* mysql56*
to
[mratwork-ius-stable]
name=MRatWork - IUS Community Packages for EL $releasever (stable)
#baseurl=http://dl.iuscommunity.org/pub/ius/stable/CentOS/$releasever/i686
baseurl=https://repo.ius.io/$releasever/i686
#mirrorlist=http://mirrors.iuscommunity.org/mirrorlist/?repo=ius-centos$releasever&arch=i686&protocol=http
enabled=1
gpgcheck=0
exclude=mysql5* mysql56*
[mratwork-ius-archive]
name=MRatWork - IUS Community Packages for EL $releasever (archive)
#baseurl=http://dl.iuscommunity.org/pub/ius/archive/CentOS/$releasever/i686
baseurl=https://repo.ius.io/archive/$releasever/i686
#mirrorlist=http://mirrors.iuscommunity.org/mirrorlist?repo=ius-centos$releasever-archive&arch=i686&protocol=http
enabled=1
gpgcheck=0
exclude=mysql5* mysql56*
[mratwork-ius-testing]
name=MRatWork - IUS Community Packages for EL $releasever (testing)
#baseurl=http://dl.iuscommunity.org/pub/ius/testing/CentOS/$releasever/i686
baseurl=https://repo.ius.io/testing/$releasever/i686
#mirrorlist=http://mirrors.iuscommunity.org/mirrorlist?repo=ius-centos$releasever-testing&arch=i686&protocol=http
enabled=1
gpgcheck=0
exclude=mysql5* mysql56*
in '/etc/yum.repos.d/mratwork.repo'.