coa dependency seems broken

```
/home/flip111/javascript/html-differ/node_modules/coa/lib/cmd.js:243
        UTIL.error(msg);
             ^

TypeError: UTIL.error is not a function
    at process.<anonymous> (/home/flip111/javascript/html-differ/node_modules/coa/lib/cmd.js:243:14)
    at Object.onceWrapper (node:events:510:26)
    at process.emit (node:events:390:28)

Node.js v17.3.0
```