add build

node_modules/pn/_promise.js

@@ -0,0 +1,6 @@
+// Allow the user to customize the Promise type returned by this library.
+var mypromise = global.Promise;
+module.exports = function getOrSetPromise(p) {
+    if (p) { mypromise = p; }
+    return mypromise;
+};