Remove library name

This PR removes the `library_name` (introduced in my previous PR) since it's not Transformers compatible.

If you still want to enable download stats, you can do so by adding `library_name: megatts-3` to the model card and then open a PR similar to this one: https://github.com/huggingface/huggingface.js/pull/1320/files. It allows you to also add a custom code snippet which appears here: https://huggingface.co/ByteDance/MegaTTS3?library=transformers

README.md

@@ -4,7 +4,6 @@ language:
 - zh
 license: apache-2.0
 pipeline_tag: text-to-speech
-library_name: transformers
 ---
 
 # Model Description