update chlog

Author: awaelchli

CHANGELOG.md

@@ -99,6 +99,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Removed the deprecated `model` argument from `ModelCheckpoint.save_checkpoint` ([#8688](https://github.com/PyTorchLightning/pytorch-lightning/pull/8688))
 
 
+- Removed the deprecated `sync_step` argument from `WandbLogger` ([#8763](https://github.com/PyTorchLightning/pytorch-lightning/pull/8763))
+
+
 ### Fixed
 
 - Fixed `trainer.fit_loop.split_idx` always returning `None` ([#8601](https://github.com/PyTorchLightning/pytorch-lightning/pull/8601))