Update mix.exs for hex release

Author: doughsay

mix.exs

@@ -15,6 +15,8 @@ defmodule Excal.MixProject do
       version: "0.1.0",
       elixir: "~> 1.6",
       start_permanent: Mix.env() == :prod,
+      description: description(),
+      package: package(),
       deps: deps(),
       test_coverage: [tool: ExCoveralls],
       preferred_cli_env: [coveralls: :test]
@@ -27,6 +29,22 @@ defmodule Excal.MixProject do
     ]
   end
 
+  defp description do
+    """
+    NIF bindings to libical providing icalendar rrule expansion.
+    """
+  end
+
+  defp package do
+    [
+      maintainers: ["Chris Dosé <[email protected]>"],
+      licenses: ["MIT"],
+      links: %{
+        "GitHub" => "https://github.com/peek-travel/excal"
+      }
+    ]
+  end
+
   defp deps do
     [
       {:benchee, "~> 0.13", only: :dev, runtime: false},