Update license metadata to link to actual `creativeml-openrail-m` license (#3)

- Update license metadata to link to actual `creativeml-openrail-m` license (cc3f00a1a71b9f86ceb09cec5f4450fd51548b20)

README.md

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