Added memory setting to build script

package.json

@@ -72,7 +72,7 @@
     "watch-css": "yarn build-css && node-sass-chokidar --include-path ./src --include-path ./node_modules src/ -o src/ --watch --recursive",
     "start-js": "react-scripts start",
     "start": "npm-run-all -p watch-css start-js",
-    "build": "yarn build-css && react-scripts build",
+    "build": "yarn build-css && react-scripts --max_old_space_size=2048 build",
     "serve": "yarn build && pm2 serve -s build",
     "test": "react-scripts test --env=jsdom",
     "eslint": "eslint \"src/**/*.{js,jsx}\" --quiet",