rm installer from package

Author: dm1try

mix.exs

@@ -14,7 +14,7 @@ defmodule NVim.Mixfile do
 
   defp package do
      [name: :nvim,
-     files: ["lib", "installer", "mix.exs", "README*"],
+     files: ["lib", "mix.exs", "README*"],
      licenses: ["Apache 2.0"],
      maintainers: ["Dmitry Dedov"],
      links: %{"GitHub" => "https://github.com/dm1try/nvim"}]