Not compatible with hubot 3?

[nneubauer]

Hi, I am trying to get this to work and followed the steps:

npm install mattermost-slashbot --save and added "mattermost-slashbot" to my external-scripts.json but when I start the hubot, I get

ERROR Cannot load adapter mattermost-slashbot - Error: Cannot find module 'hubot-mattermost-slashbot'

I don't know where the hubot- prefix comes from (maybe hubot 3?). Any idea how to solve this?