Update index.markdown
Update index.markdown

add jessie to supported platforms
mullr/puppetdb,rbrw/puppetdb,kbarber/puppetdb,waynr/puppetdb,waynr/puppetdb,senior/puppetdb,puppetlabs/puppetdb,kbarber/puppetdb,waynr/puppetdb,rbrw/puppetdb,waynr/puppetdb,senior/puppetdb,mullr/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,rbrw/puppetdb,kbarber/puppetdb,senior/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb,senior/puppetdb,puppetlabs/puppetdb,kbarber/puppetdb