0.8.1 release notes (#3363)

Co-authored-by: Zhiqiang Tang <zhiqiang.tang@rutgers.edu>
Co-authored-by: Oleksandr Shchur <oleks.shchur@gmail.com>

docs/whats_new/v0.8.1.md

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+# Version 0.8.1
+
+v0.8.1 is a bug fix release.
+
+As always, only load previously trained models using the same version of AutoGluon that they were originally trained on. 
+Loading models trained in different versions of AutoGluon is not supported.
+
+See the full commit change-log here: https://github.com/autogluon/autogluon/compare/v0.8.0...v0.8.1
+
+This version supports Python versions 3.8, 3.9, and 3.10.
+
+# Changes
+
+## Documentation improvements
+
+* Update google analytics property @gidler (#3330)
+* Add Discord Link @Innixma (#3332)
+* Add community section to website front page @Innixma (#3333)
+* Update Windows Conda install instructions @gidler (#3346)
+* Add some missing Colab buttons in tutorials @gidler (#3359)
+
+
+## Bug Fixes / General Improvements
+
+* Move PyMuPDF to optional @Innixma @zhiqiangdon (#3331)
+* Remove TIMM in core setup @Innixma (#3334)
+* Update persist_models max_memory 0.1 -> 0.4 @Innixma (#3338)
+* Lint modules @yinweisu (#3337, #3339, #3344, #3347)
+* Remove fairscale @zhiqiangdon (#3342)
+* Fix refit crash @Innixma (#3348)
+* Fix `DirectTabular` model failing for some metrics; hide warnings produced by `AutoARIMA` @shchur (#3350)
+* Pin dependencies @yinweisu (#3358)
+* Reduce per gpu batch size for AutoMM high_quality_hpo to avoid out of memory error for some corner cases @zhiqiangdon (#3360)
+* Fix HPO crash by setting reuse_actor to False @yinweisu (#3361)