Update CHANGELOG.md in preparation for 0.45.2 release
Update CHANGELOG.md in preparation for 0.45.2 release

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