REPL tool enhancement (#21)

* exit after record saved

* refactor: use inquirer instead of low level readline

* feat: ask user if record another one, instead of exit

package.json

@@ -34,11 +34,13 @@
   "homepage": "https://github.com/rrweb-io/rrweb#readme",
   "devDependencies": {
     "@types/chai": "^4.1.6",
+    "@types/inquirer": "0.0.43",
     "@types/mocha": "^5.2.5",
     "@types/node": "^10.11.7",
     "@types/puppeteer": "^1.9.0",
     "chai": "^4.2.0",
     "cross-env": "^5.2.0",
+    "inquirer": "^6.2.1",
     "jest-snapshot": "^23.6.0",
     "mocha": "^5.2.0",
     "puppeteer": "^1.9.0",