Just for convenience. Before (e.g. for go):

    kirr@teco:~$ curl http://[::1]:7778
    Hello world at `/`  ; Thu Jun  9 11:09:49 2016  (go)kirr@teco:~$

After:

    kirr@teco:~$ curl http://[::1]:7778
    Hello world at `/`  ; Thu Jun  9 11:10:36 2016  (go)
    kirr@teco:~$

Python version already emits trailing newline, because it uses `print ...`
without trailing ",".

/reviewed-by TrustMe