Update README.md (#1813)
Update README.md (#1813)

- fix link to contributors.yml
- language: improve sentence  (probably not enough)
-- language has a folder in root this repo -> a folder in root of this repo
nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir-school,nscyclone/elixir-school