Update npm dev task so it doesn’t watch the client folder

(This was causing server rebuilds on client-side changes and thus breaking hot module reloading.)

package.json

@@ -23,7 +23,7 @@
   },
   "scripts": {
     "build": "nuxt build",
-    "dev": "DEBUG=nuxt:* nodemon --watch client/ --watch server/ --watch config/ --watch nuxt.config.js server/index.js",
+    "dev": "DEBUG=nuxt:* nodemon --watch server/ --watch config/ --watch nuxt.config.js server/index.js",
     "prestart": "npm run build",
     "start": "NODE_ENV=production node server/",
     "test": "npm run -s mocha",