custom error message when wasm-bindgen fails because --web isn't available #633
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PR for #627 - check wasm-bindgen version if target = web is passed
create a custom error message when wasm-bindgen fails because --web isn't available
Change the return type of the child run commands so it can return a CommandError that also captures the stderr if the process fails.
See if the returned output contains the 'Unknown flag: --web' error message and if so provide an alternative error that suggests upgrading