add version info

Version_CN.txt

@@ -25,4 +25,5 @@
 2020-12-25：添加新程序4.01inch (F) e-Paper例程。
 2021-02-22：添加新程序2.7inch B V2 e-Paper例程。
 2021-07-19：1.54V2、2.13V3、2.9V2、7.5V2程序均采用外部波形，并提升了刷新速度
-2021-11-01：添加新程序2.13inch V3 e-Paper例程。
+2021-11-01：添加新程序2.13inch V3 e-Paper例程。
+2022-04-26：添加新程序2.13inch B V4 e-Paper例程。

Version_EN.txt

@@ -24,4 +24,5 @@
 2020-12-25: Added new program 4.01inch (F) e-Paper routine.
 2021-02-22: Added new program 2.7inch B V2 e-Paper routine.
 2021-07-19: 1.54v2, 2.13v3, 2.9v2, and 7.5v2 programs all use external waveforms and have improved refresh speed.
-2021-11-01: Added new program 2.13inch V3 e-Paper routine.
+2021-11-01: Added new program 2.13inch V3 e-Paper routine.
+2022-04-26: Added new program 2.13inch B V4 e-Paper routine.