Update license metadata to link to actual `creativeml-openrail-m` license (#17)

- Update license metadata to link to actual `creativeml-openrail-m` license (c28a14a69809cd2f5a81a76322a0356c7649a1a9)

README.md

@@ -1,5 +1,5 @@
 ---
-license: other
+license: creativeml-openrail-m
 tags:
 - stable-diffusion
 - text-to-image