김연준

Update README.md

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<b>Collected Jokes api link: https://github.com/15Dkatz/official_joke_api<br>
Opensource for slackbot module link : https://github.com/mishk0/slack-bot-api<br>
Base opensource for jokebot idea: https://github.com/bradtraversy/slack_jokebot<br><br>
Used Database: Mongodb</b><br>
Used Database: Mongodb</b><br><br><br>
![joker_fix](https://user-images.githubusercontent.com/39256000/58455581-0ce84100-815d-11e9-833c-90c7af08f52f.jpg)
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