Update changelog for 1.13.1-2 release

6 jobs for debian/1.13.1-2 in 13 minutes and 14 seconds (queued for 3 seconds)
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  Build
passed #233121
build

00:06:07

 
  Test
passed #233124
autopkgtest

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passed #233125
blhc

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passed #233123
lintian

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passed #233126
piuparts

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passed #233122
reprotest

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