Update to Porcupine v2.1

[JulianGerhard21]

Hi there,

currently I am getting:

[ERROR] keyword file belongs to a different version of the library. 
keyword file is '2.1.0' while the library is '1.9.0'.
[ERROR] loading keyword file #0 failed with 'INVALID_ARGUMENT'
Error: failed to initialize porcupine.
Error: failed to initialize porcupine.

following your tutorial. Any ideas on how to update the used porcupine version inside the bumblebee node module?

Best regards
Julian