Update dependencies and add a missing flow pragma

CHANGES.md

@@ -6,12 +6,12 @@
 
 ## Dependencies
 
-- autoprefixer: v7.1.6 → [v7.2.1](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md#721)
+- autoprefixer: v7.1.6 → [v7.2.2](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md#722)
 - copy-webpack-plugin: v4.2.1 → [v4.2.3](https://github.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md#423-2017-11-23)
 - gzip-size: v4.0.0 → [v4.1.0](https://github.com/sindresorhus/gzip-size/compare/v4.0.0...v4.1.0)
 - postcss-loader: v2.0.8 → [v2.0.9](https://github.com/postcss/postcss-loader/blob/master/CHANGELOG.md#209-2017-11-24)
 - webpack: v3.8.1 → [v3.10.0](https://github.com/webpack/webpack/releases)
-- webpack-dev-server: v2.9.4 → [v2.9.5](https://github.com/webpack/webpack-dev-server/releases)
+- webpack-dev-server: v2.9.4 → [v2.9.7](https://github.com/webpack/webpack-dev-server/releases)
 - webpack-dev-middleware: v1.12.0 → [v1.12.2](https://github.com/webpack/webpack-dev-middleware/releases)
 - webpack-hot-middleware: v2.20.0 → [v2.21.0](https://github.com/glenjamin/webpack-hot-middleware/compare/v2.20.0...v2.21.0)
 

package.json

@@ -36,7 +36,7 @@
     "detect-port": "1.2.2",
     "figures": "2.0.0",
     "filesize": "3.5.11",
-    "fs-extra": "4.0.2",
+    "fs-extra": "4.0.3",
     "gzip-size": "4.1.0",
     "inquirer": "3.3.0",
     "minimist": "1.2.0",
@@ -93,7 +93,7 @@
     "whatwg-fetch": "2.0.3",
 
     "webpack": "3.10.0",
-    "autoprefixer": "7.2.1",
+    "autoprefixer": "7.2.2",
     "babel-loader": "7.1.2",
     "case-sensitive-paths-webpack-plugin": "2.1.1",
     "copy-webpack-plugin": "4.2.3",
@@ -107,7 +107,7 @@
     "style-loader": "0.19.0",
     "url-loader": "0.6.2",
     "webpack-dev-middleware": "1.12.2",
-    "webpack-dev-server": "2.9.5",
+    "webpack-dev-server": "2.9.7",
     "webpack-hot-middleware": "2.21.0"
   },
   "devDependencies": {

src/types.js

@@ -1,3 +1,4 @@
+// @flow
 export type ErrBack = (err?: ?Error) => void;
 
 export type ServerConfig = {