chore(cli): show help when invalid flag is supplied (#1051)

* fix(bootstrap): handle invalid flags

handle invalid flags and show help in case invalid flag is supplied

ISSUES CLOSED: #1046

* cli(cli): cleanup custom logic to determine invalid flags

cleanup custom logic to determine invalid flags

ISSUES CLOSED: #1046

Author: anshumanv

lib/bootstrap.js

@@ -69,6 +69,7 @@ async function runCLI(cli, commandIsUsed) {
                     .forEach(unknown => {
                         logger.warn('Unknown argument:', unknown);
                     });
+                return cli.runHelp(process.argv);
             }
             const result = await cli.run(args, core);
             if (!result) {