[RU] lessons.specifics.plug -> 2.2.0 (#2652)
[RU] lessons.specifics.plug -> 2.2.0 (#2652)

* [RU] lessons.specifics.plug -> 2.2.0

* Update plug.md

Co-authored-by: Игорь Поляков <352485d3443802a752e1658114d2a138080721ab@kupibilet.ru>
Co-authored-by: usualMortal <4ff6f6ed86eb9fa5b69e60664d0b2c0fd8d73da1@users.noreply.github.com>
doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir_school