Update README_EN.md

Author: yanglbme

solution/2600-2699/2621.Sleep/README_EN.md

@@ -50,7 +50,7 @@ sleep(100).then(() => {
 
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-### Solution 1
+### 方法一
 
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@@ -67,23 +67,6 @@ async function sleep(millis: number): Promise<void> {
  */
 ```
 
-#### JavaScript
-
-```js
-/**
- * @param {number} millis
- * @return {Promise}
- */
-async function sleep(millis) {
-    return new Promise(r => setTimeout(r, millis));
-}
-
-/**
- * let t = Date.now()
- * sleep(100).then(() => console.log(Date.now() - t)) // 100
- */
-```
-
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