Adding prepare npm statement (#490)

* added prepare statement

* using master rrweb snapshot

Co-authored-by: filip slatinac <filipslatinac@MacBook-Pro-2.local>

package.json

@@ -3,6 +3,7 @@
   "version": "0.9.14",
   "description": "record and replay the web",
   "scripts": {
+    "prepare": "npm run bundle",
     "test": "npm run bundle:browser && cross-env TS_NODE_CACHE=false TS_NODE_FILES=true mocha -r ts-node/register test/**/*.test.ts",
     "test:watch": "PUPPETEER_HEADLESS=true npm run test -- --watch --watch-extensions js,ts",
     "repl": "npm run bundle:browser && cross-env TS_NODE_CACHE=false TS_NODE_FILES=true ts-node scripts/repl.ts",