adding CHANGELOG.md

Author: NiranjanaBinoy

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](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.1.0] - 2020-12-07
+
+### Added
+
+- TypeScript typings ([#9](https://github.com/MetaMask/obj-multiplex/pull/9))