Removed unnecessary text (#4)

- Removed unnecessary text (43a2561ebce106d6dc2dbc37f4b1a1162fee6992)


Co-authored-by: kapllan <kapllan@users.noreply.huggingface.co>

README.md

@@ -181,7 +181,7 @@ Google TPU v3-8
 
 pytorch, transformers.
 
-## Citation [optional]
+## Citation
 
 ```