Update README.md

* Mapbox Maki icons used to be BSD licensed but were swapped to the more permissive CC0 ([swapped in Aug 2014](https://github.com/mapbox/maki/commit/695297aed6ea821cfc54944dd60d0437137906ca#diff-61e0bdf7e1b43c5c93d9488b22e04170))
* Also it's CC0 not CCO
note: What is "Nori"?

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@@ -14,6 +14,6 @@ See the [wiki](https://github.com/hotosm/HDM-CartoCSS/wiki) for instructions.
 
 ## Licence
 
-- stylesheet is licenced under CCO
-- Nori icons are licenced under CCO
-- Maki icons are © [MapBox](https://www.mapbox.com/maki/)
+- stylesheet is licenced under CC0
+- Nori icons are licenced under CC0
+- [Maki icons](https://www.mapbox.com/maki/) by Mapbox are licened under CC0