var changes = require('changes-feed')
var feed = changes(db) // db is a levelup

feed.createReadStream({live:true})
  .on('data', function(data) {
    console.log('someone appended:', data)
  })

feed.append('hello')

{
  live: true,   // keep the stream open,
  since: number // only get changes >number
}

{
  change: number, // incrementing change number
  value: value    // the value appended
}