chore(package): update semistandard to version 9.0.0 (#203)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -67,7 +67,7 @@
  "power-assert": "^1.4.1",
  "proxyquire": "^1.7.10",
  "request": "^2.72.0",
- "semistandard": "^8.0.0",
+ "semistandard": "^9.0.0",
  "shelljs": "^0.7.3",
  "sinon": "^1.17.5",
  "supertest": "^2.0.0"