Relicense to MIT; update model card

README.md

@@ -1,5 +1,5 @@
 ---
-license: cc-by-4.0
+license: mit
 library_name: bpnet
 tags:
   - bpnet
@@ -130,8 +130,8 @@ predictions = model.predict([
 
 ## License & citation
 
-External data users may freely download, analyze and publish results based on any
-ENCODE data without restrictions.
+Released under the MIT license.
 
-Released under the ENCODE data-use policy. Please cite the ENCODE Project
-Consortium and the model software: BPNet (Avsec et al., Nat Genet 2021).
+The models are derived from ENCODE data (unrestricted use under the ENCODE
+data-use policy). Please cite the ENCODE Project Consortium and the model
+software: BPNet (Avsec et al., Nat Genet 2021).