chore(package): update webpack-dev-middleware to version 3.1.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
     "remark-cli": "^5.0.0",
     "remark-preset-lint-itgalaxy": "^12.0.0",
     "webpack": "^3.0.0",
-    "webpack-dev-middleware": "^1.0.0",
+    "webpack-dev-middleware": "^3.1.0",
     "webpack-hot-middleware": "^2.0.0"
   },
   "peerDependencies": {