Merge branch 'fix/readme_h4_removal' into 'master'

fix: Replace the README reference to ESP32-H4 with reference to ESP32-H2

See merge request espressif/esp-serial-flasher!63

README.md

@@ -19,7 +19,7 @@ Supported **target** microcontrollers:
 - ESP32-S3
 - ESP32-C3
 - ESP32-C2
-- ESP32-H4 (Beta1 and Beta2)
+- ESP32-H2
 
 ## Supporting new host target