Update README.md

Wiznet · Jun 1, 2020 · 191df7e · 191df7e
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@@ -75,6 +75,9 @@ These are Firmware projects (source code) based on Eclipse IDE for C/C++ Develop
 
 
 ## Revision History
+v1.2.1
+- AT Command RSP Buffer Size 20 -> 50
+
 v1.1.9
 - Add Watchdog Function