update README w.r.t USB connect via PL2303
update README w.r.t USB connect via PL2303

tve/embello,jeelabs/embello,tve/embello,tve/embello,jeelabs/embello,jeelabs/embello,smurfix/embello,jeelabs/embello,smurfix/embello,smurfix/embello,jeelabs/embello