Fix the flake8 warning rstdiff
Fix the flake8 warning rstdiff

lotabout/plugins,s2hc-johan/plugins,s2hc-johan/plugins,getnikola/plugins,lotabout/plugins,s2hc-johan/plugins,lotabout/plugins,pluser/nikola_plugins,getnikola/plugins,pluser/nikola_plugins,getnikola/plugins,pluser/nikola_plugins