Add wasm-opt-for-rust-maintenance-5 (#847)

maintenance_deliveries/wasm-opt-for-rust-maintenance-5.md

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+# Maintenance Delivery :mailbox:
+
+**The [invoice form :pencil:](https://docs.google.com/forms/d/e/1FAIpQLSfmNYaoCgrxyhzgoKQ0ynQvnNRoTmgApz9NrMp-hd8mhIiO0A/viewform) has been filled out correctly for this delivery**  
+
+* **Application Document:** https://github.com/w3f/Grants-Program/blob/master/applications/maintenance/wasm-opt-for-rust.md
+* **Delivery Number:** 5
+* **Delivery Date:** 2023/05/01
+
+
+**Context**
+
+There was little to do last month.
+Our patches to upstream Binaryen to enable Unicode on Windows are still in review,
+with upstream in the process of rewriting them to their preference.
+I responded to a request to support in-memory wasm optimization.
+
+**Deliverables**
+
+Note: a full hourly accounting of work performed is included with the invoice.
+
+| Number | Deliverable | Link | Notes |
+| ------------- | ------------- | ------------- |------------- |
+| 1. | Upstream work on unicode-correctness | https://github.com/WebAssembly/binaryen/pull/5627 | Not authored by me. |
+| 2. | More upstream work on unicode-correctness | https://github.com/WebAssembly/binaryen/pull/5671 | Not authored by me. |
+| 3. | Issue about in-memory optimization | https://github.com/brson/wasm-opt-rs/issues/141 | |
+
+**Additional Information**
+
+N/A