add immer-yjs to built-with.md

[sep2]

add immer-yjs.

y.js is a CRDT library with mutation-based API. immer-yjs allows manipulating y.js data types with the api provided by immer.

• Two-way binding between y.js and plain (nested) json object/array.
• Efficient snapshot update with structural sharing, same as immer.
• Updates to y.js are explicitly batched in transaction, you control the transaction boundary.
• Always opt-in, non-intrusive by nature (the snapshot is just a plain object after all).
• The snapshot shape & y.js binding aims to be fully customizable.
• Typescript all the way (pure js is also supported).
• Code is simple and small, no magic hidden behind, no vendor-locking.

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[github-actions[bot]]

:tada: This PR is included in version 9.0.16 :tada:

The release is available on:

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

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