Update CHANGELOG.md

Author: ananthsub

CHANGELOG.md

@@ -43,6 +43,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Logging only on `not should_accumulate()` during training ([#5417](https://github.com/PyTorchLightning/pytorch-lightning/pull/5417))
 - Resolve interpolation bug with Hydra ([#5406](https://github.com/PyTorchLightning/pytorch-lightning/pull/5406))
 - Check environ before selecting a seed to prevent warning message ([#4743](https://github.com/PyTorchLightning/pytorch-lightning/pull/4743))
+- Fixed signature mismatch in `model_to_device` of `DDPCPUHPCAccelerator` ([#5505](https://github.com/PyTorchLightning/pytorch-lightning/pull/5505))
 
 
 ## [1.1.3] - 2021-01-05