vidjil-algo: prepare CHANGELOG for release 2019.05

see #3914
10 jobs for feature-a/dev in 298 minutes and 32 seconds (queued for 5 minutes and 19 seconds)
Name Stage Failure
algo_valgrind_functional Valgrind Functional --retry will relaunch these tests.
Command exited with non-zero status 1
4264.31user 61.42system 3:11:03elapsed 37%CPU (0avgtext+0avgdata 2153992maxresident)k
173696inputs+142704outputs (1474major+11593014minor)pagefaults 0swaps
make[1]: *** [Makefile:128: valgrind_should] Error 1
make[1]: Leaving directory '/home/gitlab-runner/builds/d806ed19/0/vidjil/vidjil/algo/tests'
make: *** [Makefile:200: valgrind_should] Error 2
make: Leaving directory '/home/gitlab-runner/builds/d806ed19/0/vidjil/vidjil/algo'
ERROR: Job failed: exit status 1