Update README.md

Author: ndb796

README.md

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 * [연구소](https://www.acmicpc.net/problem/14502) (삼성): [Python 3.7 코드](/13/2.py)
 * [경쟁적 전염](https://www.acmicpc.net/problem/18405) (핵심 유형): [Python 3.7 코드](/13/3.py)
 * [괄호 변환](https://programmers.co.kr/learn/courses/30/lessons/60058) (카카오): [Python 3.7 코드](/13/4.py)
-* [연산자 끼워넣기](https://www.acmicpc.net/problem/14888) (삼성): [Python 3.7 코드](/13/5.py)
+* [연산자 끼워 넣기](https://www.acmicpc.net/problem/14888) (삼성): [Python 3.7 코드](/13/5.py)
 * [감시 피하기](https://www.acmicpc.net/problem/18428) (핵심 유형): [Python 3.7 코드](/13/6.py)
 * [인구 이동](https://www.acmicpc.net/problem/16234) (삼성): [Python 3.7 코드](/13/7.py)
 * [블록 이동하기](https://programmers.co.kr/learn/courses/30/lessons/60063) (카카오): [Python 3.7 코드](/13/8.py)