refactor: init cypress-cucumber-preprocessor install.

node_modules/browserify/test/async/src.js

@@ -0,0 +1,8 @@
+function f (x) { return new Promise(resolve => {
+  process.nextTick(() => { resolve(x) }) }) }
+
+async function add (x) {
+  return x + await f(20) + await f(30)
+}
+
+add(10).then(v => { console.log(v) })