update changes

Author: rjbou

master_changes.md

@@ -65,6 +65,7 @@ users)
   * [BUG] Fix `set-invariant: default repos were loaded instead of switch repos [#4866 @rjbou]
   * Add support for `opam switch -` (go to previous non-local switch) [#4910 @kit-ty-kate - fix 4866]
   * On loading, check for executable external files if they are in `PATH`, and warn if not the case [#4932 @rjbou - fix #4923]
+  * When inferring a 2.1+ switch invariant from 2.0 base packages, don't filter out pinned packages as that causes very wide invariants for pinned compiler packages [#5176 @dra27 - fix #4501]
 
 ## Pin
   * Switch the default version when undefined from ~dev to dev [#4949 @kit-ty-kate]
@@ -292,6 +293,7 @@ users)
   * Update opam root version test do escape `OPAMROOTVERSION` sed, it matches generated hexa temporary directory names [#5007 @AltGr]
   * Add json output test [#5143 @rjbou]
   * Add test for opam file write with format preserved bug in #4936, fixed in #4941 [#4159 @rjbou]
+  * Add test for switch upgrade from 2.0 root, with pinned compiler [#5176 @rjbou @kit-ty-kate]
 ### Engine
   * Add `opam-cat` to normalise opam file printing [#4763 @rjbou @dra27] [2.1.0~rc2 #4715]
   * Fix meld reftest: open only with failing ones [#4913 @rjbou]
@@ -448,3 +450,4 @@ users)
   * `OpamJson`: use `Jsonm` and add an `of_string` function [#5142 @rjbou]
   * `OpamStd.Config.E`: add `value_t` to allow getting environment variable value dynamically [#5111 @rjbou]
   * `OpamCompat.Unix`: add `realpath` for ocaml < 4.13, and use it in `OpamSystem` [#5152 @rjbou]
+  * `OpamCompat`: add `Lazy` module and `Lazy.map` function [#5176 @dra27]