Update CHANGELOG

Author: carmocca

CHANGELOG.md

@@ -380,6 +380,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed resetting device after `fitting/evaluating/predicting` ([#7188](https://github.com/PyTorchLightning/pytorch-lightning/pull/7188))
 
 
+- Fixed bug where `trainer.tuner.scale_batch_size(max_trials=0)` would not return the correct batch size result ([#7262](https://github.com/PyTorchLightning/pytorch-lightning/pull/7262))
+
+
 - Fixed metrics not being properly logged with `precision=16` and `manual_optimization` ([#7228](https://github.com/PyTorchLightning/pytorch-lightning/pull/7228))