Fill the Changelog with our last changes (x-ci-failures & test_time)

Author: dinosaure

CHANGES.md

@@ -10,9 +10,10 @@
   (@reynir, #527)
 * Use `realpath` to determine toolchain paths - allowing tools being symlinks
   as they are on NixOS (@greydot, #526)
-* Allow slack in sleep in test\_time (@greydot, #525)
+* Allow slack in sleep in test\_time (@greydot, #525, #535)
 * Fix build when using git worktree (.git being a file) (@reynir, #531)
 * Fix tests on OpenBSD 7.2 (@dinosaure, #535)
+* Add `x-ci-failures` on our OPAM files about CentOS 7 (@dinosaure, #535)
 
 ## v0.7.3 (2022-07-20)