add to changelog

CHANGELOG.md

@@ -3,6 +3,11 @@ Pkg v1.8 Release Notes
 
 - New `outdated::Bool` kwarg to `Pkg.status` (`--outdated` or `-o` in the REPL mode) to show
   information about packages not at the latest version.
+- New `compat::Bool` kwarg to `Pkg.status` (`--compat` or `-c` in the REPL mode) to show any [compat]
+  entries in the Project.toml.
+- New `Pkg.compat` and `pkg> compat` API endpoint for setting Project compat entries. Provides an interactive editor
+  via `pkg> compat`, or direct entry manipulation via `pkg> Foo 0.4,0.5` which can load current entries via tab-completion.
+  i.e. `pkg> compat Fo<TAB>` autocompletes to `pkg> Foo 0.4,0.5` so that new versions can be inserted easily.
 - Pkg now only tries to download packages from the package server in case the
   server tracks a registry that contains the package.