update changelog

Author: Kriechi

CHANGELOG.rst

@@ -10,7 +10,7 @@ dev
 
 **API Changes (Backward Compatible)**
 
--
+- Performance improvement: remove consumed frames in-place from data buffer.
 
 **Bugfixes**
 
@@ -25,8 +25,8 @@ dev
 - Support for PyPy 3.9 has been removed.
 - `Stream.end_stream()` now raises `NoSuchStreamError` or `StreamClosedError` exceptions, instead of a generic `KeyError`.
 - Duplicate ``content-length`` headers with different values now raise ``ProtocolError``.
-  Previously, the first ``content-length`` header was accepted and later conflicting values were ignored.
-- Parse ``content-length`` headers according to RFC9110 grammar for numbers (1*DIGIT)
+  Previously, the first ``content-length`` header was accepted and later conflicting values were ignored. Thanks to Harshal Parekh for the report.
+- Parse ``content-length`` headers according to RFC9110 grammar for numbers (1*DIGIT). Thanks to Arkadiusz Marta for the report.
 - **backfill from v4.3.0** Convert emitted events into Python `dataclass`, which introduces new constructors with required arguments.
   Instantiating these events without arguments, as previously commonly used API pattern, will no longer work.