Update license

To comply with the original repository: https://github.com/facebookresearch/nougat/blob/f5d2cd525979e24c01c72fe223feff2eda555a0c/LICENSE-MODEL.md

README.md

@@ -1,5 +1,5 @@
 ---
-license: apache-2.0
+license: cc-by-nc-4.0
 tags:
 - vision
 - nougat