fix(package): update dredd to version 11.2.8

Author: greenkeeper[bot]

package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "chai": "4.2.0",
     "cucumber": "5.1.0",
-    "dredd": "11.2.7",
+    "dredd": "11.2.8",
     "fs-extra": "8.0.1",
     "glob": "7.1.4",
     "pidtree": "0.3.0",