Those addresses are websocket servers that seem to publish wikipedia changes. The app is just subscribing to the changes by opening a websocket connection to the appropriate server.

Looking at their other repos and the addresses you linked to, looks like the project for publishing the changes is at https://github.com/hatnote/wikimon, which is in turn getting changes from an IRC feed at https://meta.wikimedia.org/wiki/Research:Data#IRC_Feeds