readme.md in appium_lib-12.0.0.rc5 vs readme.md in appium_lib-12.0.0

@@ -24,9 +24,10 @@
 - Ruby: 2.6+
 
 ### Ruby Lib and Appium
 
 - Ruby library version over `12.0.0` is based on Selenium v4
+    - Please read [changelog of 12.0.0](CHANGELOG.md#1200---2021-11-06) for more details to migrate from v11 to v12
 - Ruby library version over `9.8.0` requires Appium over `1.8`
 - Ruby library version under `9.7.5` can work with Appium under `1.7`
 
 ## Start appium server