Fix writeFileSync data

docker-compose.yml

@@ -7,3 +7,6 @@ services:
     image: registry.cliffbreak.de/trellobot
     environment:
       NODE_ENV: production 
+    volumes: 
+      - './conf.json:/usr/src/app/conf.json'
+      - './auth:/usr/src/app/.auth'

trellobot.js

@@ -316,7 +316,7 @@ events.on('updateCheckItemStateOnCard', (event, board) => {
 events.on('maxId', (id) => {
     if (latestActivityID == id) return
     latestActivityID = id
-    fs.writeFileSync('.latestActivityID', id)
+    fs.writeFileSync('.latestActivityID', id.toString())
 })
 
 const send = (embed, content = ``) => conf.channel.send(`${content} ${conf.contentString}`, { embed: embed }).catch(err => console.error(err))