Clean-up typing_extensions -- typing_extensions (#932)

* Remove compatibility constants for old Python versions. * Remove obsolete code branches. * Use f-strings. * Use new style super(). * Inline typing imports.
python · Nov 11, 2021 · 6992984 · 6992984
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diff --git a/typing_extensions/CHANGELOG b/typing_extensions/CHANGELOG
@@ -2,3 +2,21 @@
 
 Starting with version 4.0.0, typing_extensions uses Semantic Versioning.
 See the README for more information.
+
+Dropped support for Python versions 3.5 and older.
+
+Simplified backports for Python 3.6.0 and newer.
+Patch by Adam Turner (@AA-Turner).
+
+## Removed in version 4.0.0
+
+The following non-exported but non-private names have been removed as they are
+unneeded for supporting Python 3.6 and newer.
+
+- TypingMeta
+- OLD_GENERICS
+- SUBS_TREE
+- HAVE_ANNOTATED
+- HAVE_PROTOCOLS
+- V_co
+- VT_co