Typographical error

[neomafo88]

https://github.com/socialpoint-labs/sheetfu/blob/master/documentation/usage.rst#get_range_from_a1

get_max_column()
…
max_row = sheet.get_max_column()
…

should be

max_column = sheet.get_max_column()

[neomafo88]

Additionally,

~~max_row = sheet.get_max_row()~~ max_row = sheet.get_max_rows()

~~max_row = sheet.get_max_column()~~ max_column = sheet.get_max_columns()