Docs

I'm pretty sure that in the README that

`sax_none = sax_via_window(dat, win_size=6, paa_size=3, alphabet_size=3, nr_strategy=None, znorm_threshold=0.01)`
` `
`sax1`

should be

`sax_none = sax_via_window(dat, win_size=6, paa_size=3, alphabet_size=3, nr_strategy=None, z_threshold=0.01)`
` `
`sax_none`