changelog update. [skip ci]

framework/CHANGELOG.md

@@ -37,6 +37,7 @@ Yii Framework 2 Change Log
 - Enh #3230: Added `yii\filters\AccessControl::user` to support access control with different actors (qiangxue)
 - Enh #3252: Added support for case insensitive matching using ILIKE to PostgreSQL QueryBuilder (cebe)
 - Enh #3298: Supported configuring `View::theme` using a class name (netyum, qiangxue)
+- Enh #3328: `BaseMailer` generates better text body from html body (armab)
 - 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)