New types

• Add PromiseValue type (#75) 7fe70fd
• Add AsyncReturnType type (#78) ae34d9e
• Add ConditionalKeys type (#76) 8a908a3
• Add ConditionalPick type (#76) 8a908a3
• Add ConditionalExcept type (#76) 8a908a3

Enhancements

• Allow all keys to be optional in the JsonObject type (#65) 6c105fb
• Add workspaces to PackageJson type (#77) 836ecb8

v0.10.0...v0.11.0