move changelog to GitHub releases

Author: mkaput

CHANGELOG.md

@@ -53,8 +53,13 @@ iex(5)> BiMultiMap.put(mm, :a, 3)
 #BiMultiMap<[a: 1, a: 3, b: 1, b: 2]>
 ```
 
+## Changelog
+
+All notable changes to this project are documented on the [GitHub releases] page.
+
 ## License
 
 See the [LICENSE] file for license rights and limitations (MIT).
 
-[LICENSE]: https://github.com/mkaput/elixir-bimap/blob/master/LICENSE.txt
+[github releases]: https://github.com/mkaput/elixir-bimap/releases
+[license]: https://github.com/mkaput/elixir-bimap/blob/master/LICENSE.txt

README.md

@@ -15,7 +15,7 @@ defmodule BiMap.Mixfile do
       docs: [
         source_ref: "v#{@version}",
         main: "readme",
-        extras: ~w(README.md CHANGELOG.md)
+        extras: ~w(README.md)
       ],
       deps: deps(),
       package: package()
@@ -46,7 +46,6 @@ defmodule BiMap.Mixfile do
         lib
         mix.exs
         README.md
-        CHANGELOG.md
         LICENSE.txt
       ),
       maintainers: ["Marek Kaput <[email protected]>"],