fix variable/function ambiguity and update dependency versions

lib/amplitude.ex

@@ -1,7 +1,7 @@
 defmodule Amplitude do
   use Amplitude.API
 
-  @docmodule """
+  @moduledoc """
   Tools for getting data from the Worldping API
 
   Each Worldping API query accesses a different URL, not just different query

lib/api/real.ex

@@ -6,7 +6,7 @@ defmodule Amplitude.API.Real do
   defp json_header, do: ["Content-Type": "application/json"]
 
   def api_track(params) do
-    case get(api_host, [], params: [api_key: api_key, event: Poison.encode!(params)]) do
+    case get(api_host(), [], params: [api_key: api_key(), event: Poison.encode!(params)]) do
       {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
         {:ok, body}
       {:ok, %HTTPoison.Response{status_code: 404, body: body}} ->
@@ -20,5 +20,5 @@ defmodule Amplitude.API.Real do
   def verify_json({:ok, json}), do: json
   def verify_json({_, response}), do: "#{inspect(response)}"
 
-  defp process_request_headers(headers), do: headers++json_header
+  defp process_request_headers(headers), do: headers++json_header()
 end

mix.exs

@@ -28,8 +28,8 @@ defmodule Amplitude.Mixfile do
   # Type "mix help deps" for more examples and options
   defp deps do
     [
-      {:httpoison, "~> 0.9.1"},
-      {:poison, "~> 2.2.0"}
+      {:httpoison, "~> 0.11.2"},
+      {:poison, "~> 3.1.0"}
     ]
   end
 end

mix.lock

@@ -1,8 +1,9 @@
-%{"certifi": {:hex, :certifi, "0.4.0", "a7966efb868b179023618d29a407548f70c52466bf1849b9e8ebd0e34b7ea11f", [:rebar3], []},
-  "hackney": {:hex, :hackney, "1.6.1", "ddd22d42db2b50e6a155439c8811b8f6df61a4395de10509714ad2751c6da817", [:rebar3], [{:certifi, "0.4.0", [hex: :certifi, optional: false]}, {:idna, "1.2.0", [hex: :idna, optional: false]}, {:metrics, "1.0.1", [hex: :metrics, optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, optional: false]}, {:ssl_verify_fun, "1.1.0", [hex: :ssl_verify_fun, optional: false]}]},
-  "httpoison": {:hex, :httpoison, "0.9.1", "6c2b4eaf2588a6f3ef29663d28c992531ca3f0bc832a97e0359bc822978e1c5d", [:mix], [{:hackney, "~> 1.6.0", [hex: :hackney, optional: false]}]},
-  "idna": {:hex, :idna, "1.2.0", "ac62ee99da068f43c50dc69acf700e03a62a348360126260e87f2b54eced86b2", [:rebar3], []},
-  "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], []},
-  "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [:rebar3], []},
-  "poison": {:hex, :poison, "2.2.0", "4763b69a8a77bd77d26f477d196428b741261a761257ff1cf92753a0d4d24a63", [:mix], []},
-  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.0", "edee20847c42e379bf91261db474ffbe373f8acb56e9079acb6038d4e0bf414f", [:rebar, :make], []}}
+%{"certifi": {:hex, :certifi, "1.2.1", "c3904f192bd5284e5b13f20db3ceac9626e14eeacfbb492e19583cf0e37b22be", [:rebar3], [], "hexpm"},
+  "hackney": {:hex, :hackney, "1.8.3", "9148b2311f7d68aff2dc78f2be4da8f05b1a15421b9ef4199ba4935a1d39b3c1", [:rebar3], [{:certifi, "1.2.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "5.0.1", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
+  "httpoison": {:hex, :httpoison, "0.11.2", "9e59f17a473ef6948f63c51db07320477bad8ba88cf1df60a3eee01150306665", [:mix], [{:hackney, "~> 1.8.0", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"},
+  "idna": {:hex, :idna, "5.0.1", "5aa8fdce3f876f49d90daa13f071155a7c3259d02f7847dadd164da4a877da2a", [:rebar3], [{:unicode_util_compat, "0.1.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"},
+  "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [], [], "hexpm"},
+  "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [], [], "hexpm"},
+  "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
+  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.1", "28a4d65b7f59893bc2c7de786dec1e1555bd742d336043fe644ae956c3497fbe", [:make, :rebar], [], "hexpm"},
+  "unicode_util_compat": {:hex, :unicode_util_compat, "0.1.0", "f554c539c826eac8bcf101d2dbcc4a798ba8a960a176ca58d0b2f225c265b174", [:rebar3], [], "hexpm"}}