add small delay on exit from babel

Author: jamestalmage

lib/babel.js

@@ -46,6 +46,8 @@ if (!avaRequired) {
 
 process.on('message', function (message) {
 	if (message['ava-kill-command']) {
-		process.exit(0);
+		setTimeout(function () {
+			process.exit(0);
+		}, 10);
 	}
 });