Update readme.md add link to playground

Fix issue 11 (when `"strictNullChecks": false` in tsconfig.json is ca…

…uses a bugs)

Version 4.1.0

Breaking changes

Make library behavior more predictable

InferModes has been removed
Code simplification
Fix tests
Fix examples
Fix README

Version 3.3.1

Version 3.3.1

Version 3.2.0

Version 3.1.1

Version 3.1.0

Version 3.0.0