update changelog

CHANGELOG.md

@@ -11,6 +11,16 @@
 
 -->
 
+## 0.22.0
+
+### Features
+- Unicode emoji supports Unicode 14.0 emoji (#109)
+
+### Improvements
+- "（）" pair is available on outside the hashtag (#111)
+- Changes specs the center tag and strike (#108, 100fb0b)
+- Improves link label parsing (#107)
+
 ## 0.21.0
 
 npm: https://www.npmjs.com/package/mfm-js/v/0.21.0