Add 3.8.0.305 changelog (#314)

Author: Glavo

_changelog/dev.md

@@ -1,7 +1,7 @@
 ---
 layout: changelog
 channel: dev
-nowchange: 3.8.0.304
+nowchange: 3.8.0.305
 # nowpreview:
 title: 开发版更新日志
 date: 2021-08-22 23:18:02 +0800

_changelogs/dev/3.8/3.8.0.305.md

@@ -0,0 +1,12 @@
+---
+---
+
+详细版本介绍: [cv43527381](https://www.bilibili.com/opus/1128792850791661574)
+
+- GP-4724: Bump Terracotta to 0.3.12 (by Burning_TNT) 
+- GP-4698: 在被打包为 macOS App 时不设置 macOS Dock 栏图标 (by YiZhiMCQiu)
+- GP-4727: 将官方群组入口重新移动到主界面 (by Glavo)
+
+错误修复:
+
+- GP-4721: 修复 `JFXListViewSkin` 创建大量平台线程的问题 (by Glavo)