build: Use HTTPS link in package.json

Closes #148.

Author: coliff

package.json

@@ -3,7 +3,7 @@
   "title": "jQuery Contributing Hub",
   "description": "jQuery Foundation site for developer documentation",
   "version": "1.2.22",
-  "homepage": "http://contribute.jquery.com",
+  "homepage": "https://contribute.jquery.com",
   "author": {
     "name": "jQuery Foundation and other contributors"
   },