[pt] update mix tasks lesson to version 1.1.0 (#2270)
[pt] update mix tasks lesson to version 1.1.0 (#2270)


doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir-school,doomspork/elixir_school,nscyclone/elixir-school