Prep changelog for release

Author: bcomnes

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## Unreleased
+## 6.5.1 - 2018-02-11
 - Update nanotiming@7.2.0
 - Update devdeps: tap-run, dependency-check, browserify, bankai