chore(package): update semistandard to version 13.0.1

Closes #5

Author: greenkeeper[bot]

package.json

@@ -10,7 +10,7 @@
   },
   "devDependencies": {
     "mocha": "^5.2.0",
-    "semistandard": "^12.0.1",
+    "semistandard": "^13.0.1",
     "supertest": "^3.3.0"
   },
   "engines": {