Adds ability to play a track within a subfolder #2
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Hi- Great library for the DFPlayerMini. I had been looking for something easier to work with than the C for the Arduino!
This PR adds the ability to choose which folder to play from within the .play() method.
N.B. The folderplay command is 0x0F and requires a 'high' byte before the 'low parameter' byte - I use 'highparameter' as the DF Robot C code converts these two bytes into a single uint16 with the folder being the high byte and track_id the low byte.
It therefore needed some addition to the .cmd() method but this should not interfere with any existing code.
I also updated the readme to reflect the changes.