Update README URLs based on HTTP redirects

Author: RichardLitt

README.md

@@ -1,6 +1,6 @@
 # browserify-zlib
 
-Emulates Node's [zlib](http://nodejs.org/api/zlib.html) module for [Browserify](http://browserify.org)
+Emulates Node's [zlib](https://nodejs.org/api/zlib.html) module for [Browserify](http://browserify.org)
 using [pako](https://github.com/nodeca/pako). It uses the actual Node source code and passes the Node zlib tests
 by emulating the C++ binding that actually calls zlib.