Fix a mistyped word (#2238)
Fix a mistyped word (#2238)

It fixes a mistyped word in 5th paragraph of the "Managing Dependencies" section.
doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir_school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir-school,nscyclone/elixir-school