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 loosely 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).
+
+## [2.0.0] - 2017-10-10
+
+Data model: 1.0.0 (unchanged) | USB Protocol: 1.1.0 (minor bump) | Slave Protocol: 2.0.0 (major bump)
+
+- Read the hardware and user configuration area of the EEPROM upon startup and set the default keymap.
+- Greatly improve the I2C watchdog and drivers. Communication between the halves or the add-ons should never fail again.
+- Implement generic enumeration sequence and per-slave state for UHK modules, allowing add-ons to be added. **SLAVEPROTOCOL:MAJOR**
+- Make the master cache the output fields of slave modules, allowing for more frequent input updates.
+- Optimize I2C protocol scheduler resulting in increased roustness and more efficient use of I2C bandwidth.
+- Add I2C message headers containing a length header, allowing for variable-length mesages and a CRC16-CCITT checksum, allowing for robust communication. **SLAVEPROTOCOL:MAJOR**
+- Add mechanism to dump the internal state of the KL03 via SPI for debugging purposes.
+- Add merge sensor state and attached module IDs to GetDebugInfo(). **USBPROTOCOL:PATCH**
+- Throw ParserError_InvalidKeymapCount if keymapCount == 0. **DATAMODEL:PATCH**
+
+## [1.0.0] - 2017-08-30
+
+Data model: 1.0.0 | USB Protocol: 1.0.0 | Slave Protocol: 1.0.0
+
+- First Release