chore(package): update @types/node to version 8.0.0

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "lodash": "^4.17.4",
     "@types/lodash": "^4.14.45",
     "@types/mocha": "^2.2.35",
-    "@types/node": "^7.0.0",
+    "@types/node": "^8.0.0",
     "assert": "^1.4.1",
     "blanket": "1.1.9",
     "codecov": "^2.0.1",