Add changelog.

CHANGELOG.md

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+# 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]
+
+## [0.1.0] - 2017-08-11
+### Information
+**The API has been largely changed, so code compiled against latest version will not compile without changes!**
+### Added
+- Time frame filters for fixtures.
+- Competition - will replace SoccerSeason in compliance with the documentation of Version 1 of the Football-Data API.
+- Introduce FixtureStatus_{Postponed,Scheduled,Timed}.
+- Set methods for HttpClient and Token.
+- Fluent-style configuration methods as alternatives to the Set{HttpClient,Token} methods.
+### Changed
+- Fix invalid return value of LeagueTable methods.
+- Fix typo in naming of "LastUpdated" field in SoccerSeason (now Competition) struct.
+- Fix #6 where some fields are sometimes not decoded properly or at all.
+- Fix `TeamsOfCompetition` using the wrong URL to fetch data.
+### Known issues
+- There is no way to configure the wanted data format (`minified`/`full`/`compressed`). This will be provided in some way in an upcoming version.
+
+[Unreleased]: https://github.com/icedream/go-footballdata/compare/v0.1.0...develop
+[0.1.0]: https://github.com/icedream/go-footballdata/compare/055b2a4227d16de49751e27660ba4b172d334987...v0.1.0