[racket] Ubuntu PPA update for 6.1.1

From: Asumu Takikawa (asumu at ccs.neu.edu)
Date: Mon Nov 10 18:32:27 EST 2014

Hi all,

I've updated the Ubuntu PPA for v6.1.1:
  https://launchpad.net/~plt/+archive/ubuntu/racket

It should support precise, trusty, and utopic.

As usual, please let me know if there any packaging bugs.

Cheers,
Asumu

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