[docs] prettify changelog, bump it

9 jobs for 0.10.3 in 48 minutes and 9 seconds (queued for 3 seconds)
latest
Status Name Job ID Coverage
  Code Check
passed code-check #19821

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  Build
passed build_docker_image #19822
docker-in-docker

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  Tests
passed tests #19823

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  Package
passed package:amd64_jessie #19824

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passed package:amd64_stretch #19825

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passed package:amd64_zesty #19826

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  Benchmark
passed memory #19828
benchmark

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passed responsiveness #19829
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passed time-cpu #19827
benchmark

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