Support TS 4.0+ #101
Description
Pretty simple, the package.json should support TS 4.0 which was just released. I would submit a PR to make the change, but I'm not sure what you'd prefer to use, e.g. ^3.0.0 || ^4.0.0 would work, or >= 3.0.0. Depends on your preferences I guess.
(TS doesn't use semantic versioning, so 3.9 -> 4.0 is no different than 3.9 -> 3.10 to them.)