Remove delay module

src/delay.js

@@ -0,0 +1,13 @@
+'use strict';
+
+exports = module.exports = delay;
+
+const assert = require('assert');
+
+function delay(msecs) {
+    assert.strictEqual(typeof msecs, 'number');
+
+    return new Promise(function (resolve) {
+        setTimeout(resolve, msecs);
+    });
+}