Wasm SIMD support is missing or broken

[Ameobea]

Describe the Bug

wasm-snip fails to parse Wasm that contains SIMD instructions such as v128:

error: failed to parse code section
  caused by found type v128
  caused by expected type i32
  caused by The input WebAssembly is invalid

Steps to Reproduce

1. Take a Wasm file that uses SIMD instructions (example: https://ameo.link/u/8oc.wasm)
2. Use it as input for wasm-snip: wasm-snip 8oc.wasm

Additional Context

This might just be a matter of bumping the wasm parsing libraries. However, some other Wasm tooling I use wasm-opt and wasm2wat both require special command line arguments to be passed in order to deal with SIMD.

[sagacity]

I've rebased wasm-snip on top of Walrus 0.19.0 and that seems to work. However, I'm not sure if this project is currently active or not, since this issue has been open for so long, so I don't know whether I should prepare a pull request or not.