auto update README.md

Author: chech2

README.md

@@ -389,6 +389,7 @@
 |18310. 안테나|[링크](./%EB%B0%B1%EC%A4%80/Silver/18310.%E2%80%85%EC%95%88%ED%85%8C%EB%82%98/README.md)|
 |18352. 특정 거리의 도시 찾기|[링크](./%EB%B0%B1%EC%A4%80/Silver/18352.%E2%80%85%ED%8A%B9%EC%A0%95%E2%80%85%EA%B1%B0%EB%A6%AC%EC%9D%98%E2%80%85%EB%8F%84%EC%8B%9C%E2%80%85%EC%B0%BE%EA%B8%B0/%ED%8A%B9%EC%A0%95%E2%80%85%EA%B1%B0%EB%A6%AC%EC%9D%98%E2%80%85%EB%8F%84%EC%8B%9C%E2%80%85%EC%B0%BE%EA%B8%B0.java)|
 |1912. 연속합|[링크](./%EB%B0%B1%EC%A4%80/Silver/1912.%E2%80%85%EC%97%B0%EC%86%8D%ED%95%A9/README.md)|
+|1920. 수 찾기|[링크](./%EB%B0%B1%EC%A4%80/Silver/1920.%E2%80%85%EC%88%98%E2%80%85%EC%B0%BE%EA%B8%B0/README.md)|
 |1927. 최소 힙|[링크](./%EB%B0%B1%EC%A4%80/Silver/1927.%E2%80%85%EC%B5%9C%EC%86%8C%E2%80%85%ED%9E%99/README.md)|
 |1931. 회의실 배정|[링크](./%EB%B0%B1%EC%A4%80/Silver/1931.%E2%80%85%ED%9A%8C%EC%9D%98%EC%8B%A4%E2%80%85%EB%B0%B0%EC%A0%95/README.md)|
 |1932. 정수 삼각형|[링크](./%EB%B0%B1%EC%A4%80/Silver/1932.%E2%80%85%EC%A0%95%EC%88%98%E2%80%85%EC%82%BC%EA%B0%81%ED%98%95/%EC%A0%95%EC%88%98%E2%80%85%EC%82%BC%EA%B0%81%ED%98%95.java)|