Copy the badge code for the latest
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<img src="https://licenses.dev/b/cargo/retain_mut" alt="licenses" />
</a>
Or the badge code for the 0.1.9
version:
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<a href="https://licenses.dev/cargo/retain_mut/0.1.9">
<img src="https://licenses.dev/b/cargo/retain_mut/0.1.9" alt="licenses" />
</a>