docs(CHANGELOG): Update changelog

Author: Peter Marton

CHANGELOG.md

@@ -0,0 +1,21 @@
+<a name="8.0.0"></a>
+## 8.0.0 (2019-05-06)
+
+
+#### Bug Fixes
+
+* topLevelFields should not serialize known VError proto fields (#91) ([3060c9c6](https://github.com/restify/errors.git/commit/3060c9c6))
+* remove duplication of serialized Error properties (#90) ([1da7c76f](https://github.com/restify/errors.git/commit/1da7c76f))
+
+
+#### Features
+
+* **HttpError:** use @netflix/nerror instead of verror ([a37b7f00](https://github.com/restify/errors.git/commit/a37b7f00))
+
+
+#### Breaking Changes
+
+* drop 4.x and 6.x Node support
+
+ ([56daf0b1](https://github.com/restify/errors.git/commit/56daf0b1))
+