Summary:
Pull Request resolved: https://github.com/facebook/duckling/pull/533
In recent versions of Data.Some the name of the constructor, `This` has changed name to `Some`. This has become rather problematic for us to migrate so we're just going to remove the dependency. The meat of this diff is adding the type `Seal` to `Duckling.Types`. That type replaces `Some`.
Reviewed By: pepeiborra
Differential Revision: D23929459
fbshipit-source-id: 8ff4146ecba4f1119a17899961b2d877547f6e4f