TYPE: bug fix

KEYWORDS: http, README

SOURCE: internal

DESCRIPTION OF CHANGES:
The README file incorrectly provided the WRF URL protocol as "http". It is actually "https". This presented no
troubles to users, as the web server resolved the correct address automatically.

LIST OF MODIFIED FILES: 
modified:   README.md

TESTS CONDUCTED: 
1. Text only, so no external testing required.
2. Changes to README.md, so no jenkins testing done.