Update release note for 1.55.0.

Added a line about new formatting option, `{lib}`, for `cargo tree` (rust-lang/cargo#9663).
rust-lang · Aug 19, 2021 · 52a9883 · 52a9883
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commit 52a9883
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diff --git a/RELEASES.md b/RELEASES.md
@@ -70,6 +70,7 @@ Cargo
 - [The package definition in `cargo metadata` now includes the `"default_run"`
   field from the manifest.][cargo/9550]
 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
+- [Added `{lib}` as formatting option for `cargo tree` to print the "lib_name" of packages.][cargo/9663]
 
 Rustdoc
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