Refactor `mutate` methods

[timdeschryver]

          One thing I noticed is that the current implementation is using the `mutate` function, which will be removed as part of the v17 Angular release. I'll take a look and try to update the example to take that into account

Originally posted by @goetzrobin in #20 (comment)

[github-actions]

🎉 This issue has been resolved in version 1.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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