Update readme to reflect migration to fossil

FossilOrigin-Name: f54738dbc854a52a0ed4c102468a92ef6562487f5496cc13b9506ac6e227bbbc
iMarv · Jul 6, 2022 · 796ba11 · 796ba11
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+__Note__: This is a downstream git-mirror of my personal [fossil](https://fossil-scm.org/) repository. Changes in git won't be sent back upstream.
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 # Option
 
 Deno module inspired by Rusts `Option<T>` to help handling `null` and