Add changelog for 2.1.1

rust-lang · Feb 5, 2025 · 328556d · 328556d
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+# 2.1.1
+
+- Change the internal algorithm to better accomodate large hashmaps.
+  This mitigates a [regression with 2.0 in rustc](https://github.com/rust-lang/rust/issues/135477).
+  See [PR#55](https://github.com/rust-lang/rustc-hash/pull/55) for more details on the change (this PR was not merged).
+  This problem might be improved with changes to hashbrown in the future.
+
 ## 2.1.0
 
 - Implement `Clone` for `FxRandomState`