Docs: fix link to takumi-rs #2
Description
if takumi-rsrelates to https://docs.rs/takumi/latest/takumi/, then the link in the README probably needs to be replaced with https://github.com/kane50613/takumi
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if takumi-rsrelates to https://docs.rs/takumi/latest/takumi/, then the link in the README probably needs to be replaced with https://github.com/kane50613/takumi