0.3.0 Migrate to null-safety. 0.2.0 Add support for Web based projects 0.1.0 Allow "platform" to opt for io or html (Thanks to Keal Jones) 0.0.3 Allow listener to be optional. Added test framework (Thanks to Michael Marner). 0.0.2 Added license. 0.0.1 - October 8th, 2018 Initial release.