Added cross-env for setting env cross-platform (#42)

Fixes
npm run dev fails on Windows
Download#3

SEE
Build does not work on Windows
#41

Author: Download

package.json

@@ -3,10 +3,10 @@
   "version": "4.0.0",
   "description": "Ready-to-go Preact starter project powered by webpack.",
   "scripts": {
-    "dev": "NODE_ENV=development webpack-dev-server --inline --hot --progress",
+    "dev": "cross-env NODE_ENV=development webpack-dev-server --inline --hot --progress",
     "start": "superstatic build -p ${PORT:-8080} --host 0.0.0.0 --gzip -c '{\"rewrites\": [{\"source\":\"**\",\"destination\":\"index.html\"}],\"headers\":[{\"source\":\"**\",\"headers\":[{\"key\":\"Cache-Control\",\"value\":\"max-age=86400\"}]}]}'",
     "prestart": "npm run build",
-    "build": "NODE_ENV=production webpack -p --progress",
+    "build": "cross-env NODE_ENV=production webpack -p --progress",
     "prebuild": "mkdir -p build && ncp src/assets build/assets",
     "test": "npm run -s lint && npm run -s test:karma",
     "test:karma": "karma start test/karma.conf.js --single-run",
@@ -34,6 +34,7 @@
     "babel-runtime": "^6.6.1",
     "chai": "^3.5.0",
     "core-js": "^2.2.1",
+    "cross-env": "^2.0.0",
     "css-loader": "^0.23.1",
     "eslint": "^3.0.1",
     "extract-text-webpack-plugin": "^1.0.1",