Adding cross-env to support development on windows. (#134)

Author: dgautsch

package-lock.json

@@ -7,7 +7,7 @@
     "scripts": {
         "check": "npm run docs:lint && npm run lint && npm run test && npm run functional",
         "check:light": "npm run lint && npm run test",
-        "dev": "NODE_ENV=dev webpack-dev-server --mode=development --content-base sandbox --config webpack.config.js --inline --hot --port 3002",
+        "dev": "cross-env NODE_ENV=dev webpack-dev-server --mode=development --content-base sandbox --config webpack.config.js --inline --hot --port 3002",
         "dist:rd3g": "rm -rf dist/ && webpack --config webpack.config.dist.js -p --display-modules --optimize-minimize",
         "dist:sandbox": "webpack --config webpack.config.js -p",
         "dist:transpile": "./node_modules/babel-cli/bin/babel.js -d lib src",
@@ -52,6 +52,7 @@
         "babel-preset-es2017": "6.24.1",
         "babel-preset-react": "6.24.1",
         "babel-preset-stage-0": "6.24.1",
+        "cross-env": "^5.2.0",
         "css-loader": "0.28.7",
         "cypress": "2.1.0",
         "d3": "^5.5.0",