docs: v2.11.2 changelog

Author: kozistr

docs/changelogs/v2.11.2.md

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+## Change Log
+
+### Fix
+
+* Fix Lookahead optimizer (#200, #201, #202)
+  * When using PyTorch Lightning which expects your optimiser to be a subclass of `Optimizer`.
+
+### Contributions
+
+thanks to @georg-wolflein
+
+### Diff
+
+[2.11.1...2.11.2](https://github.com/kozistr/pytorch_optimizer/compare/v2.11.1...v2.11.2)