Upgrade to latest wasm-bindgen@0.2.86

[sectore]

to avoid issue with latest cargo-leptos v0.1.10

Error: at `~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cargo-leptos-0.1.10/src/compile/front.rs:46:30`

Caused by:
    0: at `~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cargo-leptos-0.1.10/src/compile/front.rs:111:10`
1: 

       it looks like the Rust project used to create this wasm file was linked against
       version of wasm-bindgen that uses a different bindgen format than this binary:

         rust wasm file schema version: 0.2.84
            this binary schema version: 0.2.86

       Currently the bindgen format is unstable enough that these two schema versions
       must exactly match. You can accomplish this by either updating this binary or 
       the wasm-bindgen dependency in the Rust project.

       You should be able to update the wasm-bindgen dependency with:

           cargo update -p wasm-bindgen --precise 0.2.86

       don't forget to recompile your wasm file! Alternatively, you can update the 
       binary with:

           cargo install -f wasm-bindgen-cli --version 0.2.84

       if this warning fails to go away though and you're not sure what to do feel free
       to open an issue at https://github.com/rustwasm/wasm-bindgen/issues!

[gbj]

Excellent, thanks very much!