Update Evan Hahn's author URL to HTTPS

Author: EvanHahn

package.json

@@ -2,7 +2,7 @@
   "name": "helmet",
   "author": "Adam Baldwin <baldwin@andyet.net> (http://andyet.net/team/baldwin)",
   "contributors": [
-    "Evan Hahn <me@evanhahn.com> (http://evanhahn.com)"
+    "Evan Hahn <me@evanhahn.com> (https://evanhahn.com)"
   ],
   "description": "help secure Express/Connect apps with various HTTP headers",
   "version": "3.5.0",