Prelease 1.1.2rc (#5171)

* update CHANGELOG.md, increment for RC

* Add missing changelog update

* Added a few more

* Move to added

* Address code review

* Missing space

* Remove unreleased

* Remove lines

* Update CHANGELOG.md

Co-authored-by: Rohit Gupta <rohitgr1998@gmail.com>

CHANGELOG.md

@@ -9,6 +9,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Added
 
+- Support number for logging with `sync_dist=True` ([#5080](https://github.com/PyTorchLightning/pytorch-lightning/pull/5080)
+
 
 ### Changed
 
@@ -18,9 +20,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Removed
 
+- `enable_pl_optimizer=False` by default to temporarily fix AMP issues ([#5163](https://github.com/PyTorchLightning/pytorch-lightning/pull/5163)
+
 
 ### Fixed
 
+- Metric reduction with Logging ([#5150](https://github.com/PyTorchLightning/pytorch-lightning/pull/5150)
 
 ## [1.1.0] - 2020-12-09