Added changelog

Author: Brian Zenowich

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/). 
+
+## [dev-3.0.0]
+
+- Python3 support
+- Clang support
+- Updated dependencies (Boost, Eigen, Freeglut)
+- Allowed WAM loop to run while reading BHand sensors
+- Converted ex10 haptics visualization from vpython to OpenGL
+- Based WAM loop on a (100x) more accurate timer_fd instead of sleep()
+- More robust installation script
+- Improved mutex handling for non-rt operation
+- Offered Top10 tactile values from BHand for higher update rates
+
+[dev-3.0.0]: https://git.barrett.com/software/libbarrett/-/tags/dev-3.0.0
+