Lint check as part of npm test

Lint check should be triggered before the tape tests.

Author: watilde

package.json

@@ -9,6 +9,7 @@
   "scripts": {
     "lint": "semistandard",
     "prepublish": "./downloadCurrentVersion.js && ./verifyVersion.js",
+    "pretest": "npm run lint",
     "test": "tape ./test/index.js"
   },
   "repository": {