Update changelog

Author: infctr

CHANGELOG.md

@@ -5,6 +5,12 @@ 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).
 
+## [1.4.0] - 2020-09-22
+
+### Changed
+
+- Support typescript v4 and @typescript-eslint/parser v4 as peer deps
+
 ## [1.3.0] - 2020-07-16
 
 ### Changed