0.1.3 Free function from memory if $isAlive is null

What's Changed

• Free function from memory if $isAlive is null by @vudaltsov in #2

Full Changelog: 0.1.2...0.1.3

0.1.2 Support `null` values

What's Changed

• Support null values, add tests by @vudaltsov in #1

Full Changelog: 0.1.1...0.1.2

0.1.1 Rename $factory to $function

Changed

• Rename Once::$factory to Once::$function.

0.1.0 Initial release

Improve README.md