message: Fix links in README.md
  The files have been updated from `.js` to `.ts`, so update the links
  to point to the proper TypeScript file.
diff: @@ -42,7 +42,7 @@ var ast = recast.parse(code);
  ```
  Now do *whatever* you want to `ast`. Really, anything at all!
  -See [ast-types](https://github.com/benjamn/ast-types) (especially the [def/core.js](https://github.com/benjamn/ast-types/blob/master/def/core.js)) module for a thorough overview of the `ast` API.
  +See [ast-types](https://github.com/benjamn/ast-types) (especially the [def/core.ts](https://github.com/benjamn/ast-types/blob/master/def/core.ts)) module for a thorough overview of the `ast` API.
  ```js
  // Grab a reference to the function declaration we just parsed.
  var add = ast.program.body[0];
  @@ -173,7 +173,7 @@ Note also that the source maps generated by Recast are character-by-character ma
  Options
  ---
  All Recast API functions take second parameter with configuration options, documented in
  -[options.js](https://github.com/benjamn/recast/blob/master/lib/options.js)
  +[options.ts](https://github.com/benjamn/recast/blob/master/lib/options.ts)
  Motivation
  ---
  