Add changelog entries

Author: williamdes

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.2.0] - 2020-11-XX
+
+- Drop `ERASE_TO_LINE_END_2` and `ERASE_TO_LINE_END_1` constants from `AnsiEscapeSequences` because they where broken.
+- Add `ERASE_TO_LINE_END` to `AnsiEscapeSequences`
+- Add `ErrorFormatter\RawTextErrorFormatter` that reflects a Doctum error output format
+- Add `OutputFormat` to handle the input/output user choice
+
 ## [1.1.0] - 2020-11-27
 
 - Add `isDecorated` method on `SymfonyOutput` class and `Output` interface.