Update changelog for 1.9.11-5 release

6 jobs for debian/1.9.11-5 in 8 minutes and 31 seconds (queued for 1 second)
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  Build
passed #245496
build

00:03:23

 
  Test
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autopkgtest

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passed #245500
blhc

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passed #245498
lintian

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passed #245501
piuparts

00:05:06

passed #245497
reprotest

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