update change log

2020-08-25 18:26:10 +08:00 · 2020-08-25 18:26:10 +08:00 · 58e538b0bd
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+# 2.9.9-alpha (2020-08-25)
+
+### Optmization
+
+- **borderBox:** Canonical class name.
+- **autoResize(mixin):** Add exception prompt.
+
 # 2.9.8-alpha (2020-08-20)

 ### Optmization