Update README.md

README.md

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-![I2S-4MFlash](https://github.com/sle118/squeezelite-esp32/workflows/I2S%2D4MFlash/badge.svg)
+![I2S-4MFlash-master-cmake](https://github.com/sle118/squeezelite-esp32/workflows/I2S-4MBFlash/badge.svg?branch=master-cmake)
 
 # Squeezelite-esp32
 ## Supported Hardware