README: add note in usage section about webservers
README: add note in usage section about webservers

diegobill/graphite,diegobill/graphite,mbabic/graphite,bitmonk/chef-graphite,tas50/graphite,mbabic/graphite,tas50/graphite,hw-cookbooks/graphite,bitmonk/chef-graphite,hw-cookbooks/graphite,diegobill/graphite,hw-cookbooks/graphite,tas50/graphite,mbabic/graphite,bitmonk/chef-graphite