tail to file - output in one line

[valentin-krasontovitsch]

Using the current master branch (d0af9ca), on Mac, when tailing and writing the output to a file, the output gets written in one line.

Among other things this makes it very hard to read.

Exemplary command:

bonire --host mygraylog.mydomain --endpoint /api --port 9000 -o test.log \
    -r STREAMID -u USER -n 1000 -@ "2 days ago" "tag:help"

Is this intended behavior?