Create 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](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] - 2019-02-17
+### Added
+- Code cleanup
+- Buffer over-read bug fix
+- U2F counter endianness bug fix
+- More testing
+- Extension interface to U2F and FIDO2
+    - Read firmware version
+    - Read RNG bytes