Fixes.

node_modules/please-upgrade-node/index.js

@@ -0,0 +1,25 @@
+var semverCompare = require('semver-compare')
+
+module.exports = function pleaseUpgradeNode(pkg, opts) {
+  var opts = opts || {}
+  var requiredVersion = pkg.engines.node.replace('>=', '')
+  var currentVersion = process.version.replace('v', '')
+  if (semverCompare(currentVersion, requiredVersion) === -1) {
+    if (opts.message) {
+      console.error(opts.message(requiredVersion))
+    } else {
+      console.error(
+        pkg.name +
+          ' requires at least version ' +
+          requiredVersion +
+          ' of Node, please upgrade'
+      )
+    }
+
+    if (opts.hasOwnProperty('exitCode')) {
+      process.exit(opts.exitCode)
+    } else {
+      process.exit(1)
+    }
+  }
+}