fix(package): update filesize to version 6.0.1

Closes #104

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "express": "^4.14.0",
     "extract-text-webpack-plugin": "2.0.0-beta.4",
     "file-loader": "^0.9.0",
-    "filesize": "^3.3.0",
+    "filesize": "^6.0.1",
     "findup": "^0.1.5",
     "fs-extra": "^1.0.0",
     "handlebars": "^4.0.5",