ci: remove nsp from tests (#569)

Fixes auth0/node-jsonwebtoken#567

Author: shaq-senior-expert

package.json

@@ -21,7 +21,7 @@
   "scripts": {
     "lint": "eslint .",
     "coverage": "nyc mocha",
-    "test": "npm run lint && npm run coverage && nsp check && cost-of-modules"
+    "test": "npm run lint && npm run coverage && cost-of-modules"
   },
   "repository": {
     "type": "git",