Update Changelog_CN.md

Author: RVC-Boss

docs/cn/Changelog_CN.md

@@ -232,5 +232,16 @@
 
 7-计时逻辑优化 https://github.com/RVC-Boss/GPT-SoVITS/pull/1387
 
+### 20240821
+
+1-fast_inference分支合并进main：https://github.com/RVC-Boss/GPT-SoVITS/pull/1490
+ 
+2-支持通过ssml标签优化数字、电话、时间日期等：https://github.com/RVC-Boss/GPT-SoVITS/issues/1508
+ 
+3-api修复优化：https://github.com/RVC-Boss/GPT-SoVITS/pull/1503
+ 
+4-修复了参考音频混合只能上传一条的bug:https://github.com/RVC-Boss/GPT-SoVITS/pull/1422
+ 
+5-增加了各种数据集检查,若缺失会弹出warning:https://github.com/RVC-Boss/GPT-SoVITS/pull/1422