Remove changelog entry for an internal change

We removed internal code left over after removing a feature in Mbed TLS 3.0.
The removal of the internal code is not user-visible.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/remove_ssl_session_compression.txt b/ChangeLog.d/remove_ssl_session_compression.txt
deleted file mode 100644
index dc59f1c..0000000
--- a/ChangeLog.d/remove_ssl_session_compression.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-Removals
-   * Remove compression property from SSL session struct.
-     MBEDTLS_SSL_COMPRESS_NULL is now the only supported
-     compression option and can be used for compatibility
-     reasons. Changes requested in #4223.