feature: add optional --quiet argument

Suppress log messages from output.

- Use logger middleware only if `--quiet` is `false`

src/cli/run.js

@@ -44,10 +44,13 @@ function createApp (source, object, routes, argv) {
   var defaults
   if (argv.static) {
     defaults = jsonServer.defaults({
+      logger: !argv.quiet,
       static: path.join(process.cwd(), argv.static)
     })
   } else {
-    defaults = jsonServer.defaults()
+    defaults = jsonServer.defaults({
+      logger: !argv.quiet
+    })
   }
 
   app.use(defaults)
@@ -79,6 +82,11 @@ module.exports = function (argv) {
     process.exit(1)
   }
 
+  // noop log fn
+  if (argv.quiet) {
+    console.log = function () {}
+  }
+
   console.log()
   console.log(chalk.cyan('  \\{^_^}/ hi!'))