add support handler's view

[afanasevps]

Hi, at the moment, it case of class-based handler view, self argument is removed

organizing handlers in classes - https://docs.aiohttp.org/en/stable/web_quickstart.html#organizing-handlers-in-classes

similarly issue - https://github.com/dchaplinsky/aiohttp_validate/pull/151

Thanks!

[andreyrusanov]

@afanasevps it has been fixed here: https://github.com/dchaplinsky/aiohttp_validate/pull/151

Try to install from master branch. Perhaps it hasn't been released yet.