Fix `license` metadata to standard format (#2)

- Fix `license` metadata to standard format (8ff6198a27952b894fa12bcb0ebfce205789cac6)


Co-authored-by: Julien Chaumond <[email protected]>

README.md

@@ -1,5 +1,5 @@
 ---
-license: CC BY-NC-ND 4.0
+license: cc-by-nc-nd-4.0
 ---
 # Dataset Card for `lbox_open`