Update Poolboy lesson for Elixir 1.4 and improve wording  (#1147)
Update Poolboy lesson for Elixir 1.4 and improve wording  (#1147)

* Reflect changes in Elixir 1.4 to Poolboy lesson

Signed-off-by: Bonghyun Kim <fbc2a31a9a8531983f3717da27fe00fe3b544a20@gmail.com>

* Improve wording and code readability

Signed-off-by: Bonghyun Kim <fbc2a31a9a8531983f3717da27fe00fe3b544a20@gmail.com>

* Update metdata from 1.0.0 to 1.1.0

nscyclone/elixir-school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,psantos10/elixir-school,psantos10/elixir-school,erickgnavar/elixir-school,psantos10/elixir-school,doomspork/elixir-school,erickgnavar/elixir-school,erickgnavar/elixir-school,doomspork/elixir-school