fix(build): use eslint in lint script

Author: jankapunkt

package.json

@@ -4,7 +4,8 @@
   "description": "OAuth provider for express",
   "main": "index.js",
   "scripts": {
-    "lint": "jshint .",
+    "lint": "npx eslint .",
+    "lint:fix": "npx eslint . --fix",
     "test": "NODE_ENV=test ./node_modules/.bin/mocha 'test/**/*_test.js'",
     "test-debug": "NODE_ENV=test ./node_modules/.bin/mocha  --inspect --debug-brk 'test/**/*_test.js'",
     "test:watch": "NODE_ENV=test ./node_modules/.bin/mocha --watch 'test/**/*_test.js'",