Update license metadata to link to actual `creativeml-openrail-m` license (#61)

- Update license metadata to link to actual `creativeml-openrail-m` license (7f210fac9bbc55dcc6d63798d4ea25e5dc8289b6)

README.md

@@ -1,5 +1,5 @@
 ---
-license: other
+license: creativeml-openrail-m
 tags:
 - stable-diffusion
 - stable-diffusion-diffusers