chore(package): update gulp to version 4.0.1

greenkeeper[bot] · greenkeeper[bot] · commit 79b3e3f14d3c · 2019-04-21T17:21:37.000Z
Closes #31
diff --git a/package.json b/package.json
@@ -34,7 +34,7 @@
     "dgeni": "^0.4.2",
     "dgeni-alive": "^0.4.0",
     "grunt": "^1.0.1",
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.1",
     "ink-docstrap": "^1.2.0",
     "jasmine-core": "^2.4.1",
     "karma": "^1.3.0",
