docs: docs housekeeping

List of changes:
- add changelog link to module info page
- add title to license page
- link changelog to releases page

mix.exs

@@ -37,7 +37,10 @@ defmodule Tesla.Mixfile do
     [
       maintainers: ["Tymon Tobolski"],
       licenses: ["MIT"],
-      links: %{"GitHub" => "https://github.com/elixir-tesla/tesla"}
+      links: %{
+        "GitHub" => @source_url,
+        "Changelog" => "#{@source_url}/releases"
+      }
     ]
   end
 
@@ -93,17 +96,14 @@ defmodule Tesla.Mixfile do
       source_url: @source_url,
       source_ref: "v#{@version}",
       skip_undefined_reference_warnings_on: [
-        "CHANGELOG.md",
         "guides/howtos/migrations/v1-macro-migration.md"
       ],
       extra_section: "GUIDES",
       logo: "guides/elixir-tesla-logo.png",
       extras:
         [
           "README.md",
-          "LICENSE"
-          # TODO: add CHANGELOG.md
-          # "CHANGELOG.md"
+          "LICENSE": [title: "License"],
         ] ++ Path.wildcard("guides/**/*.{cheatmd,md}"),
       groups_for_extras: [
         Explanations: ~r"/explanations/",