update electron to v43

electron/node_modules/tiny-async-pool/lib/es6.js

@@ -0,0 +1,24 @@
+function asyncPool(poolLimit, iterable, iteratorFn) {
+  let i = 0;
+  const ret = [];
+  const executing = new Set();
+  const enqueue = function() {
+    if (i === iterable.length) {
+      return Promise.resolve();
+    }
+    const item = iterable[i++];
+    const p = Promise.resolve().then(() => iteratorFn(item, iterable));
+    ret.push(p);
+    executing.add(p);
+    const clean = () => executing.delete(p);
+    p.then(clean).catch(clean);
+    let r = Promise.resolve();
+    if (executing.size >= poolLimit) {
+      r = Promise.race(executing);
+    }
+    return r.then(() => enqueue());
+  };
+  return enqueue().then(() => Promise.all(ret));
+}
+
+module.exports = asyncPool;