chore(package): update standard to version 8.0.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -27,7 +27,7 @@
     "xtend": "^4.0.1"
   },
   "devDependencies": {
-    "standard": "^7.1.2",
+    "standard": "^8.0.0",
     "tape": "^4.5.1"
   }
 }