Version bump to 0.5.3
Version bump to 0.5.2
Version bump to 0.5.1
Version bump to 0.5.0
Version bump to 0.4.3
Version bump to 0.4.2
Add typespec
Version bump to 0.4.0
Version bump to 0.3.1
Add ability for init/1 to return the same types as handle_in et al