Add CHANGELOG.md

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]
+*No unreleased changes*
+
+## [0.9.0] - 2018-07-01
+### Added
+- Class for translation options.
+- Word gender support for translation options.
+- Definition support.
+
+### Changed
+- Fix incorrect limit for tts.
+
+## [0.8.0] - 2018-06-04
+### Added
+- Qt internationalization support.
+- Function to get the source text.
+- Static `defaultLocaleToCode()`, `codeToLanguage()` and `languageToCode()` functions.
+- The `error()` method to check for translation errors.
+- Inherite from `QObject`.
+
+### Changed
+- Rewrite list of languages in accordance with the official Google documentation.
+- Splite queries to parts if they exceed the limit.
+- Rename some functions.
+- Improve network error output.
+- Fix Cyrillic playback on Windows.
+- Fix the incorrect parsing of sentences with the line break and non-breaking space.
+- Fix wrong interpretation of some special characters.
+- Fix empty translation language.
+
+### Removed
+- Unused `LANGUAGE_LONG_CODES`.
+- Text-to-speech functions (now instead of playing, `translationMedia()` and `sourceMedia()` will return a playlist that can be used in [QMediaPlayer](https://doc.qt.io/qt-5/qmediaplayer.html "Qt Documentation")).
+- Extra constructors.
+- Static variables with languages and their codes (now they accessible from `codes()` and `languages()`).
+
+## [0.7.0] - 2018-03-20
+### Added
+- Ability to create an object.
+- Ability to get source and translation language.
+- Ability to get transcription.
+- Ability to get translation options.
+- Ability to automatically correct grammatical errors and typos of source text.
+
+### Changed
+- Fix translation of several sentences.
+- Fix the output of network errors.
+
+## [0.3.0] - 2018-03-14
+*Initial release*