Changelog update [skip ci]

framework/CHANGELOG.md

@@ -47,6 +47,7 @@ Yii Framework 2 Change Log
 - Enh #3298: Supported configuring `View::theme` using a class name (netyum, qiangxue)
 - Enh #3328: `BaseMailer` generates better text body from html body (armab)
 - Enh #3518: `yii\helpers\Html::encode()` now replaces invalid code sequences with "�" (DaSourcerer)
+- Enh #4372: `yii\filters\HttpCache` failed to comply to RFC 7232
 - Enh: Added support for using sub-queries when building a DB query with `IN` condition (qiangxue)
 - Enh: Supported adding a new response formatter without the need to reconfigure existing formatters (qiangxue)
 - Enh: Added `yii\web\UrlManager::addRules()` to simplify adding new URL rules (qiangxue)