Update search crawler recommendation

[dudewad]

I've noticed that google no longer recommends the hashbang approach, they've deprecated it in favor of just letting their search engine be super smart. Recommend updating your readme to stop recommending the #! approach. Take a look at the site you reference which is deprecated via a notice at the top, linking to the following document:
http://googlewebmastercentral.blogspot.com/2015/10/deprecating-our-ajax-crawling-scheme.html
Hope that helps.