added prepublish script

Author: corevo

packages/selenium-ide/package.json

@@ -10,7 +10,8 @@
     "build-prod": "rm -rf build && env NODE_ENV=production yarn build",
     "build-chrome": "./build.sh build ../../selenium-ide.pem 1>/dev/null && mkdir -p dist && mv build.crx dist/selenium-ide.crx && echo \"Wrote dist/selenium-ide.crx\"",
     "build-firefox": "web-ext sign -s build -a dist --api-key=$AMO_JWT_ISSUER --api-secret=$AMO_JWT_SECRET --id=$(cat ../../.web-extension-id)",
-    "version": "node scripts/version.js"
+    "version": "node scripts/version.js",
+    "prepublishOnly": "yarn build-prod"
   },
   "devDependencies": {
     "autoprefixer": "^7.1.4",