Update changelog for v2.0

Author: eriwen

CHANGELOG.md

@@ -1,3 +1,20 @@
+## v2.0.0
+
+### ES6 Support
+
+ES6 code is now parsed and enhanced!
+
+### Extensible StackFrames
+
+StackFrames returned are now able to report on whether a function call was a `Constructor`, `native` code, or `eval` code. 
+
+### MIT License
+
+The community [has voted](https://github.com/stacktracejs/stacktrace.js/issues/187) to change the license of the project to the [MIT License](https://opensource.org/licenses/MIT)
+
+## v1.3.0
+* `Stacktrace.getSync()` gets a stack trace, synchronously. It does not attempt to map sources or guess function names, because those typically require network requests.
+
 ## v1.2.0
 
 * `StackTrace.report` now accepts an error message argument, and will add a `message: "given thing"` to the JSON payload if it is provided.