Fix: Kakao OAuth Failure - Headers for authorization

[channprj]

Issue Summary

This fixes Kakao backends. User token must be included in request header like below:

POST /v1/user/signup HTTP/1.1
Host: kapi.kakao.com
Authorization: Bearer {access_token}
Content-Type: application/x-www-form-urlencoded;charset=utf-8

I tested and it works in python 3.6.3. Feel free to check and test my code and you can do whatever you want with it.

Reference

See Kakao API Docs for more details.

Todo

• Add profile image if it allowed to provide
• Improve test code

I'll do it if I have more time. Thank you for reading it. ☺️