README: update list of companies using flashls center columns related to https://github.com/mangui/flashls/issues/459
README: update list of companies using flashls
center columns
related to https://github.com/mangui/flashls/issues/459

hola/flashls,clappr/flashls,jlacivita/flashls,clappr/flashls,vidible/vdb-flashls,tedconf/flashls,fixedmachine/flashls,mangui/flashls,mangui/flashls,neilrackett/flashls,fixedmachine/flashls,hola/flashls,tedconf/flashls,neilrackett/flashls,vidible/vdb-flashls,jlacivita/flashls