change acorn-jsx to acorn-6to5

lib/6to5/util.js

@@ -1,6 +1,6 @@
 var estraverse = require("estraverse");
 var traverse   = require("./traverse");
-var acorn      = require("acorn-jsx");
+var acorn      = require("acorn-6to5");
 var path       = require("path");
 var util       = require("util");
 var fs         = require("fs");

package.json

@@ -47,7 +47,7 @@
     "chokidar": "0.10.0",
     "source-map-support": "0.2.7",
     "esutils": "1.1.4",
-    "acorn-jsx": "https://github.com/sebmck/acorn-jsx/archive/master.tar.gz",
+    "acorn-6to5": "https://github.com/sebmck/acorn-6to5/archive/master.tar.gz",
     "acorn-ast-types": "0.5.3-1",
     "estraverse": "^1.7.0"
   },