playbot misbehaves when printing '\r'

[niconii]

15:59 <cbreeden> playbot: print!("\r\r\r\r\r\r\n\r\r\r\r\r\r");
16:00 -- Notice(playbot): NOTICE #rust-offtopic :PONG :levin.mozilla.org
...
16:00 <ubsan> playbot: print!("\r\r\r");
16:01 <cbreeden> playbot: "you ok buddy?"
16:01 -- Notice(playbot): NOTICE #rust-offtopic :"you ok buddy?"
...
16:03 <-- playbot (playbot@moz-gb1b8d.compute.amazonaws.com) has quit (Ping timeout: 121 seconds)

It should probably just filter out \r before printing.

#301 fixed this (as well as the error pastes)