node: bad option: --experimental-wasm-threads
node.js flag `--experimental-wasm-threads` returns error when running package.json script `test`:

```
> monero-ts@0.9.4 test
> npm run build_commonjs && node --enable-source-maps --no-experimental-fetch --experimental-wasm-threads node_modules/mocha/bin/_mocha --require @babel/register "dist/src/test/TestAll" --timeout 900000000 --exit


> monero-ts@0.9.4 build_commonjs
> babel ./src  --extensions ".js,.ts" --out-dir ./dist/src && babel ./index.ts  --extensions ".ts" --out-dir ./dist && shx mkdir -p dist/dist && shx cp dist/monero_wallet_full.js dist/monero_wallet_keys.js dist/dist && shx cp dist/*.js.map dist/dist && shx cp dist/*.wasm dist/dist

Successfully compiled 94 files with Babel (2504ms).
Successfully compiled 1 file with Babel (404ms).
node: bad option: --experimental-wasm-threads

Process finished with exit code 9
```

The flag should perhaps be removed as it isn't a valid option:
https://nodejs.org/api/cli.html
