Add changelog and update to 0.2.1

CHANGELOG.md

@@ -0,0 +1,22 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.2.1] - 2017-09-12
+### Added
+- Added logo to documentation
+
+## [0.2.0] - 2017-09-11
+### Added
+- Better documentation to `Schedule.occurrences/1` to explain the duration option on schedules.
+
+## 0.0.1 - 2017-09-08
+### Initial release
+
+[Unreleased]: https://github.com/peek-travel/cocktail/compare/0.2.1...HEAD
+[0.2.1]: https://github.com/peek-travel/cocktail/compare/0.2.0...0.2.1
+[0.2.0]: https://github.com/peek-travel/cocktail/compare/0.1.0...0.2.0

README.md

@@ -27,7 +27,7 @@ by adding `cocktail` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:cocktail, "~> 0.2.0"}
+    {:cocktail, "~> 0.2"}
   ]
 end
 ```

mix.exs

@@ -1,7 +1,7 @@
 defmodule Cocktail.Mixfile do
   use Mix.Project
 
-  @version "0.2.0"
+  @version "0.2.1"
 
   def project do
     [