Update README.md

Geekhyt · web-flow · commit 7e3fe3c481f5 · 2021-01-22T01:17:06.000+08:00
diff --git a/README.md b/README.md
@@ -6,3 +6,4 @@
 
 - [1.两数之和](https://github.com/Geekhyt/javascript-leetcode/issues/1)
 - [11.盛水最多的容器](https://github.com/Geekhyt/javascript-leetcode/issues/2)
+- [15.三数之和](https://github.com/Geekhyt/javascript-leetcode/issues/3)

Original file line number	Diff line number	Diff line change
`@@ -6,3 +6,4 @@`
`6`	`6`
`7`	`7`	`- [1.两数之和](https://github.com/Geekhyt/javascript-leetcode/issues/1)`
`8`	`8`	`- [11.盛水最多的容器](https://github.com/Geekhyt/javascript-leetcode/issues/2)`
	`9`	`+- [15.三数之和](https://github.com/Geekhyt/javascript-leetcode/issues/3)`