minor fix to README
minor fix to README

interlegis/puppet-varnish,rdeknijf/puppet-varnish,interlegis/puppet-varnish,bigon/puppet-varnish,voroniys/puppet-varnish,sanoma-technology/puppet-varnish,voroniys/puppet-varnish,sanoma-technology/puppet-varnish,maxchk/puppet-varnish,maxchk/puppet-varnish,usertesting/puppet-varnish,usertesting/puppet-varnish,joshuaspence/puppet-varnish,rweich/puppet-varnish,no-limit-network/puppet-varnish,ByteInternet/puppet-varnish,joshuaspence/puppet-varnish,no-limit-network/puppet-varnish,rdeknijf/puppet-varnish,ByteInternet/puppet-varnish,rweich/puppet-varnish,carroarmato0/puppet-varnish,bigon/puppet-varnish,carroarmato0/puppet-varnish