Update CHANGELOG.md

stepancheg · Nov 14, 2023 · 4cffee8 · 4cffee8
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 ## [3.3] - Unreleased
 
+* [Unnecessary copy in print_to_string_internal](https://github.com/stepancheg/rust-protobuf/pull/684)
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 ## [3.3.0] - 2023-09-30
 
 * [protoc_extra_arg not passed through](https://github.com/stepancheg/rust-protobuf/issues/643)