fix a link

Author: zloirock

README.md

@@ -173,7 +173,7 @@ structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
       - [`String.dedent`](#stringdedent)
       - [`RegExp` escaping](#regexp-escaping)
       - [`Symbol` predicates](#symbol-predicates)
-      - [`Uint8Array` to / from base64 and hex](#uint8array-to-from-base64-and-hex)
+      - [`Uint8Array` to / from base64 and hex](#uint8array-to--from-base64-and-hex)
     - [Stage 1 proposals](#stage-1-proposals)
       - [`Observable`](#observable)
       - [New collections methods](#new-collections-methods)