Fix forward to scope & closures in README

Was pointing to
http://www.shanehudson.net/2014/05/03/foreword-dont-know-js/
but needs to point to
https://shanehudson.net/2014/06/03/foreword-dont-know-js/

The important part there is the 06 vs the 05.
Merge pull request #190 from geolessel/fix_forward_link

Fix forward to scope & closures in README