Update `setenv()` to take an optional value, also bugfix for `setenv()`

returning a value.

1 files changed, 2 insertions, 0 deletions

diff --git a/CHANGES.md b/CHANGES.md
index f54e4d05..0bbe387f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -24,6 +24,8 @@
 - Added `at_cleanup()` to register cleanup functions.
 - Added `recursive` argument to `Path.create_directory()` to create parent
   directories if needed.
+- `setenv()` now takes an optional parameter for value, which allows for
+  unsetting environment values.
 - Deprecated:
   - Sets are no longer a separate type with separate methods.
     - Instead of sets, use tables with a value type of `{KeyType:Empty}`.