Revert "Remove monkeypatch"

This reverts commit 1d454e3.

package.json

@@ -8,7 +8,8 @@
     "build": "ng build",
     "test": "ng test --watch=false",
     "lint": "ng lint",
-    "e2e": "ng e2e"
+    "e2e": "ng e2e",
+    "postinstall": "node patch.js"
   },
   "private": true,
   "dependencies": {

patch.js

@@ -0,0 +1,13 @@
+const fs = require('fs');
+const f = 'node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/browser.js';
+
+fs.readFile(f, 'utf8', function (err,data) {
+      if (err) {
+              return console.log(err);
+            }
+      var result = data.replace(/node: false/g, 'node: {crypto: true, stream: true}');
+
+      fs.writeFile(f, result, 'utf8', function (err) {
+              if (err) return console.log(err);
+            });
+});