Add node modules and new code for release (#39)

Co-authored-by: tbarnes94 <tbarnes94@users.noreply.github.com>

node_modules/yargs/yargs.js

@@ -0,0 +1,14 @@
+'use strict'
+
+// an async function fails early in Node.js versions prior to 8.
+async function requiresNode8OrGreater () {}
+requiresNode8OrGreater()
+
+const { Yargs, rebase } = require('./build/lib/yargs')
+const Parser = require('yargs-parser')
+
+exports = module.exports = Yargs
+exports.rebase = rebase
+
+// allow consumers to directly use the version of yargs-parser used by yargs
+exports.Parser = Parser