Use non_neg_integer type in signature

Author: lukaszsamson

lib/elixir_sense/core/metadata.ex

@@ -46,7 +46,7 @@ defmodule ElixirSense.Core.Metadata do
             moduledoc_positions: %{}
 
   @type signature_t :: %{
-          optional(:active_param) => :non_neg_integer,
+          optional(:active_param) => non_neg_integer(),
           name: String.t(),
           params: [String.t()],
           spec: String.t(),