Make @types/node a devDependency

package.json

@@ -32,7 +32,6 @@
   "homepage": "https://github.com/hydrabolt/discord.js#readme",
   "runkitExampleFilename": "./docs/examples/ping.js",
   "dependencies": {
-    "@types/node": "^7.0.0",
     "long": "^3.2.0",
     "prism-media": "^0.0.1",
     "snekfetch": "^3.0.0",
@@ -49,6 +48,7 @@
     "libsodium-wrappers": "^0.5.1"
   },
   "devDependencies": {
+    "@types/node": "^7.0.0",
     "discord.js-docgen": "hydrabolt/discord.js-docgen",
     "eslint": "^3.19.0",
     "parallel-webpack": "^1.6.0",