Logging is not working

expected_outlog.txt

$ node index.js
[-isodate-]    INFO    init    start
[-isodate-]    INFO    init    end
123

index.js

var seneca = require('seneca')()

seneca.add({ cmd: 'salestax' }, function (args, callback) {
  var rate = 0.23
  var total = args.net * (1 + rate)
  callback(null, { total: total })
})

seneca.act({ cmd: 'salestax', net: 100 }, function (err, result) {
  if (err) return console.error(err)
  console.log(result.total)
})

output.log

123
{"kind":"notice","notice":"hello seneca 7s5nvcfmqcty/1511881045504/14997/3.4.3/-","level":"info","seneca":"7s5nvcfmqcty/1511881045504/14997/3.4.3/-","when":1511881045570}