[cling] README: use githack.com CDN url (NFC).
[cling] README: use githack.com CDN url (NFC).

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root