Add ChangeLog entry

Author: eregon

CHANGELOG.md

@@ -16,6 +16,8 @@ Bug fixes:
 * `autoload :C, "path"; require "path"` now correctly triggers the autoload.
 * Fixed `UDPSocket#bind` to specify family and socktype when resolving address.
 * The `shell` standard library can now be `require`-d.
+* Fixed a bug where `for` could result in a `NullPointerException` when trying
+  to assign the iteration variable.
 
 # 1.0 RC 14