Release v0.5.1

Update to Elixir v0.14.0

Release v0.4.4

Update to Elixir v0.13.2

Release v0.4.2

Release v0.4.1

Release v0.4.0 with v0.13.0 support

Release v0.3.0

Update plug docs, release 0.2.0

Merge pull request elixir-plug#3 from matheusca/new_elixir_version

Updated mix.exs for the new elixir 0.12.0 version