Prepare CHANGELOG.md

3 jobs for master in 5 minutes and 10 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed dune:git clang C++17 #86130

00:02:51

passed dune:git gcc-6 C++14 #86132

00:02:16

passed dune:git gcc-8 C++17 #86131

00:03:28