Configure acorn to allow for returns outside of fn - #18

Still can't eval that file but at least its not on acorn

Author: cldwalker

README.md

@@ -10,6 +10,8 @@ The official JavaScript language plugin for Light Table.
     curl https://raw.githubusercontent.com/codemirror/CodeMirror/$VERSION/mode/javascript/javascript.js > codemirror/javascript.js
 
   `javascript.js` is currently on CodeMirror version 4.8.0.
+* We rely on acorn for parsing JS. See [its readme](https://github.com/ternjs/acorn#main-parser) for
+  several parsing options
 
 ###License