Merge remote-tracking branch 'origin/greenkeeper-istanbul-0.4.5'

package.json

@@ -46,7 +46,7 @@
   },
   "devDependencies": {
     "coveralls": "~2.11.14",
-    "istanbul": "~0.4.2",
+    "istanbul": "~0.4.5",
     "mocha": "~3.1.2",
     "mocha-lcov-reporter": "~1.2.0"
   }