feat: Stream output

Pipe output from execa to stdout and stderr.

Closes: #9

Author: mischah

cli.js

@@ -76,10 +76,6 @@ if (Object.keys(cli.flags).map(key => typeof cli.flags[key]).some(type => type =
 }
 
 errorNotifier(cli.input[0], cli.flags)
-	.then(result => {
-		console.log(result.stdout || result.stderr);
-	})
 	.catch(error => {
-		console.error(error.stdout || error.stderr);
 		process.exit(error.code);
 	});

lib/error-notifier.js

@@ -7,8 +7,10 @@ module.exports = (command, opts) => {
 	opts = opts || {};
 
 	return new Promise((resolve, reject) => {
-		execa.shell(command, {env: {FORCE_COLOR: true}})
-			.then(result => resolve(result))
+		const execaPending = execa.shell(command, {env: {FORCE_COLOR: true}});
+		execaPending.stdout.pipe(process.stdout);
+		execaPending.stderr.pipe(process.stderr);
+		return execaPending.then(result => resolve(result))
 			.catch(error => notifier.notify(notifierOptions(opts), () => reject(error)));
 	});
 };