Update PGP key for Luke Dashjr (BD02942421F4889F)

[luke-jr]

Same key, just with a later expiration date (previous export expires in 2 weeks).

[harding]

Verified new key and old key have the same fingerprint. In the absence of critical feedback, this pull will be merged around 22:00 UTC on Thursday.

Current:

pub   8192R/21F4889F 2012-03-23 [expires: 2015-06-09]
      Key fingerprint = E463 A93F 5F31 17EE DE6C  7316 BD02 9424 21F4 889F
uid                  Luke Dashjr <luke@dashjr.org>
uid                  Luke Dashjr <luke-jr+git@utopios.org>
uid                  Luke Dashjr <luke-jr@dashjr.org>
sub   8192R/CC42DE42 2012-03-23 [expires: 2015-06-09]

Commit 363d29f833e601ef86fcf6b1b54118c458e3fa7c

pub   8192R/21F4889F 2012-03-23 [expires: 2016-06-09]
      Key fingerprint = E463 A93F 5F31 17EE DE6C  7316 BD02 9424 21F4 889F
uid                  Luke Dashjr <luke@dashjr.org>
uid                  Luke Dashjr <luke-jr+git@utopios.org>
uid                  Luke Dashjr <luke-jr@dashjr.org>
sub   8192R/CC42DE42 2012-03-23 [expires: 2016-06-09]