Update CHANGELOG.md in preparation for 0.43.2 release
Update CHANGELOG.md in preparation for 0.43.2 release

sgebbie/ponyc,dipinhora/ponyc,ponylang/ponyc,sgebbie/ponyc,dipinhora/ponyc,dipinhora/ponyc,sgebbie/ponyc,jemc/ponyc,sgebbie/ponyc,jemc/ponyc,sgebbie/ponyc,ponylang/ponyc,jemc/ponyc,ponylang/ponyc