Include "npm audit fix" in the upgrade script

Author: JamesMessinger

package.json

@@ -45,7 +45,7 @@
     "coverage": "npm run coverage:node && npm run coverage:browser",
     "coverage:node": "nyc --reporter=text --reporter=lcov --report-dir coverage/node node_modules/mocha/bin/mocha",
     "coverage:browser": "npm run test:browser -- --coverage",
-    "upgrade": "npm-check -u",
+    "upgrade": "npm-check -u && npm audit fix",
     "bump": "bump --tag --push --all",
     "release": "npm run upgrade && npm test && npm run bump"
   },