fix: Use cross-env to enable Windows + non-cygwin environments to build

related to issue #86

Author: The Editor

package.json

@@ -9,7 +9,7 @@
     "test": "npm run test-unit && eslint src && npm run prerender -- /dev/null && rm -rf lib",
     "test-unit": "mocha --compilers js:babel-register test",
     "prerender": "babel src --out-dir lib && node lib/render.js",
-    "build": "NODE_ENV=production browserify src/index.js | uglifyjs -c -m > bundle.js && npm run prerender -- index.html",
+    "build": "cross-env NODE_ENV=production browserify src/index.js | uglifyjs -c -m > bundle.js && npm run prerender -- index.html",
     "release": "standard-version && git push --follow-tags origin master; npm publish"
   },
   "browserify": {
@@ -59,6 +59,7 @@
   "devDependencies": {
     "babel-register": "^6.3.13",
     "budo": "^11.0.0",
+    "cross-env": "^5.1.6",
     "cz-conventional-changelog": "2.1.0",
     "expect": "^23.0.1",
     "mocha": "^5.0.0",