Update changelog for 0.6.8-2 release

8 jobs for debian/0.6.8-2 in 8 minutes and 10 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #247527
build

00:03:26

 
  Test
passed #247532
autopkgtest

00:03:58

passed #247533
blhc

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passed #247531
lintian

00:01:50

passed #247534
piuparts

00:04:38

passed #247530
reprotest

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passed #247529
test-build-all

00:03:24

passed #247528
test-build-any

00:02:15