Switching to dynamic import

Author: aarongustafson

src/createTransformer.js

@@ -1,5 +1,5 @@
-import mdx from "@mdx-js/mdx";
-import babel from "babel-core";
+var mdx = import("@mdx-js/mdx");
+var babel = import("babel-core");
 
 createTransformer = function(preMdxParseCallback) {
   return function(src, filename, config, options) {