Document vertical swing mode

https://github.com/dlarrick/pykumo/blob/c97fe6a5a58a2915d4791bcc92a4cdf6d8ab8cd4/pykumo/py_kumo.py#L310

README.md

@@ -68,7 +68,7 @@ Entity attributes can tell you more about the current state of the indoor unit,
 - `min_temp`: The minimum temperature the unit can be set to. For example, `45`.
 - `max_temp`: The maximum temperature the unit can be set to: For example, `95`.
 - `fan_modes`: The different modes supported for the fan. This corresponds to fan speed, and noise. For example: `superQuiet, quiet, low, powerful, superPowerful, auto`.
-- `swing_modes`: The different modes supported for the fan vanes. For example: `horizontal, midhorizontal, midpoint, midvertical, auto, swing`.
+- `swing_modes`: The different modes supported for the fan vanes. For example: `horizontal, midhorizontal, midpoint, midvertical, vertical, auto, swing`.
 - `current_temperature`: The current ambient temperature, as sensed by the indoor unit. For example, `73`.
 - `temperature`: The target temperature. For example, `77`.
 - `fan_mode`: The current mode for the fan. For example, `auto`.