docs: point to new TS handbook (#40)

README.md

@@ -252,7 +252,7 @@ el.className // TypeScript will report error when compiling
 In runtime, if you pass an invalid selector string to `querySelector` or
 `querySelectorAll` function, it will throw an error instead of returning
 `null` or `undefined` or anything else.
-For details, please read [TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/basic-types.html#never).
+For details, please read [TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#the-never-type).
 
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