update parser to ES6
We're using a pretty old fork of esprima at the moment which doesn't support ES6 syntax. Updating to ES6 will fix #96 (closed) and should help fix some source map bugs #13 (closed).
We're using a pretty old fork of esprima at the moment which doesn't support ES6 syntax. Updating to ES6 will fix #96 (closed) and should help fix some source map bugs #13 (closed).