Tiny bug fix and probable improvement to your very enjoyable tool, please read below

[ANAU-designs]

Fixed - [pyserial_version] declared and initialised: useful when flashing an Arduino Leonardo board Updated - shebang removed in favor of the use of env (man env) more versatile and useful to portability

[sudar]

Thanks @ANAU-designs for your contribution.

Let me do some more checks regarding the shebang change and will merge it if everything looks good.