[css-color-hdr] Update Optics Express link for Safdar et al

Author: svgeesus

css-color-hdr-1/Overview.bs

@@ -78,7 +78,7 @@ WPT Display: open
 				"Kim, Youn Jin",
 				"Luo, Ming Ronnier"
 			],
-			"href": "https://www.osapublishing.org/DirectPDFAccess/33630C0F-CFF9-6328-FA6195B4E962F4D7_368272/oe-25-13-15131.pdf?da=1&id=368272&seq=0&mobile=no",
+			"href": "https://opg.optica.org/oe/fulltext.cfm?uri=oe-25-13-15131&id=368272",
 			"title": "Perceptually uniform color space for image signals including high dynamic range and wide gamut",
 			"publisher": "Optics Express, vol 24 no 13 pp. 15131-15151",
 			"rawDate": "2017-06-26"