Require elixir 1.11+

Author: nshafer

mix.exs

@@ -6,7 +6,7 @@ defmodule Plug.Assign.Mixfile do
       app: :plug_assign,
       name: "Plug.Assign",
       version: "2.0.0",
-      elixir: "~> 1.15.0",
+      elixir: "~> 1.11",
       build_embedded: Mix.env() == :prod,
       start_permanent: Mix.env() == :prod,
       deps: deps(),