fix(package): copy json file on build

Author: adamweeks

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "build": "rimraf build; npm run webpack-app; npm run webpack-main",
     "webpack-app": "webpack --progress --profile --colors --display-error-details --display-cached --mode=production",
-    "webpack-main": "NODE_ENV=production webpack --config webpack.config.main.js --progress --profile --colors --display-error-details --display-cached --mode=production",
+    "webpack-main": "NODE_ENV=production webpack --config webpack.config.main.js --progress --profile --colors --display-error-details --display-cached --mode=production && cp src/package.json build/",
     "watch": "webpack --watch --progress --profile --colors --display-error-details --display-cached",
     "release-mac": "electron-packager build/ gifbar --platform=darwin --arch=x64 --overwrite --no-tmpdr --out=releases/ --app-version=$npm_package_version --icon=gifbar-icon.icns --no-prune",
     "release-win": "electron-packager build/ gifbar --platform=win32 --arch=x64 --overwrite --no-tmpdr --out=releases/ --app-version=$npm_package_version --icon=gifbar-icon.icns --no-prune",