Update README.md

[dvershinin]

Packaged the VMOD for Varnish 4.1 and 6.0 LTS. The Readme update is for install instructions from RPM repository. More in blog post: https://www.getpagespeed.com/server-setup/varnish-geoip

[codecov[bot]]

Codecov Report

Merging #31 into devel will not change coverage. The diff coverage is n/a.

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[fgsch]

First, thanks for the PR! I've added the installation instructions to the wiki instead, hope you don't mind. I will add a link to that entry from the README shortly.

[fgsch]

@dvershinin isn't yum-config-manager --enable getpagespeed-extras-varnishXX needed for 4.0?

[dvershinin]

@fgsch not needed for 4.x. The default repository (one that you have enabled after yum install https://extras.getpagespeed.com/release-el7-latest.rpm has Varnish 4.1.x and its VMODs available for install right away.

Example:

The yum-config-manager --enable getpagespeed-extras-varnishXX is only needed for Varnish 6.0.

In fact, if someone were on Varnish 4.1 first and then want to upgrade to 6.0, then can just do the yum-config-manager --enable getpagespeed-extras-varnish60 and yum update varnish and that would allow for easy upgrade to corresponding VMODs: