doc: fix API version links in README.md

Author: null8626

README.md

@@ -9,10 +9,10 @@ The community-maintained Node.js library for Top.gg.
 - [Installation](#installation)
 - [Setting up](#setting-up)
 - [Usage](#usage)
-  - [API v1](#api-v1)
+  - [API v1](#api-v1-1)
     - [Getting your project's vote information of a user](#getting-your-projects-vote-information-of-a-user)
     - [Posting your bot's application commands list](#posting-your-bots-application-commands-list)
-  - [API v0](#api-v0)
+  - [API v0](#api-v0-1)
     - [Getting a bot](#getting-a-bot)
     - [Getting several bots](#getting-several-bots)
     - [Getting your project's voters](#getting-your-projects-voters)
@@ -269,4 +269,4 @@ app.post("/votes", webhook.listener(vote => {
 }));
 
 app.listen(8080);
-```
+```