Update sinon from 5.0.3 to 5.0.4

Author: dependencies-bot

packages/generator/app/templates/package.json

@@ -58,7 +58,7 @@
     "karma-webpack": "3.0.0",
     "mocha": "5.1.1",
     "react-test-renderer": "16.3.2",
-    "sinon": "5.0.3",
+    "sinon": "5.0.4",
     "sinon-chai": "3.0.0",
     "stylelint": "9.2.0",
     "xvfb-maybe": "0.2.1",