chore: v0.2.1

feat: validate function return values (tv-labs#75)

feat: private state API (tv-labs#72)

feat: add a changelog (tv-labs#71)

Fix typespec for Lua.API.install/3 (tv-labs#60)

Fix Lua.Table.as_string with nested tables (tv-labs#57)

Auto wrap functions passed to Lua.set! to receive %Lua{} (tv-labs#53)

v0.0.19 - update to Luerl 1.2.2

use released version of luerl