Cannot edit displayed speed unit "m/s"

[usereight8]

I'm trying to change the velocity units in ipyleaflet's Velocity but it seems that any change in the display_options dictionary is ineffective.

`from ipyleaflet import Map, TileLayer, basemaps
from ipyleaflet.velocity import Velocity
import xarray as xr
import os

if not os.path.exists('wind-global.nc'):
url = 'https://github.com/benbovy/xvelmap/raw/master/notebooks/wind-global.nc'
import requests
r = requests.get(url)
wind_data = r.content
with open('wind-global.nc', 'wb') as f:
f.write(wind_data)

center = [0, 0]
zoom = 1
m = Map(center=center, zoom=zoom, interpolation='nearest', basemap=basemaps.CartoDB.DarkMatter)

ds = xr.open_dataset('wind-global.nc')
display_options = {
"velocityType": "Global Wind",
"position": "topleft",
"emptyString": "No velocity data33",
"angleConvention": "bearingCW",
"displayPosition": "topleft",
"displayEmptyString": "No velocity data33",
"speedUnit": "k/h",
}
wind = Velocity(data=ds,
zonal_speed='u_wind',
meridional_speed='v_wind',
latitude_dimension='lat',
longitude_dimension='lon',
velocity_scale=0.01,
max_velocity=20,
display_options=display_options)
m.add(wind)

m`

I've tried editing the dictionary without any noticable changes. I've also tried some editing in the L.Control.Velocity.js file.

My main goal is to be able to display a different string rather than "m/s", as I can do the math conversion for the numbers before feeding them to the velocity module.