[bugfix] Check LightningOptimizer doesn't delete optimizer hooks (#6305)

* update * resolve bug
Lightning-AI · Mar 9, 2021 · eca299b · eca299b
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -63,6 +63,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Ensure we check deepspeed/sharded in multinode DDP ([#6297](https://github.com/PyTorchLightning/pytorch-lightning/pull/6297)
 
 
+- Check `LightningOptimizer` doesn't delete optimizer hooks ([#6305](https://github.com/PyTorchLightning/pytorch-lightning/pull/6305)
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 ## [1.2.2] - 2021-03-02
 
 ### Added