Upgrade delayed devDependency from ^1.0.1 to ^2.0.0 (#659)

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "bustermove": "^1.0.0",
     "concat-stream": "^2.0.0",
     "coveralls": "^3.0.2",
-    "delayed": "^1.0.1",
+    "delayed": "^2.0.0",
     "dependency-check": "^3.3.0",
     "encoding-down": "^6.0.0",
     "hallmark": "^0.1.0",