Enable checking for pep8 confirmance in tox
Enable checking for pep8 confirmance in tox

Also make sure to ignore E741 naming a variable as l will raise this error and
reason is l is similar to 1 and people might get confused. For me it doesn't
look like an error hence ignored in tox.ini

warner/magic-wormhole,warner/magic-wormhole,warner/magic-wormhole,warner/magic-wormhole