📝 Add CodeRabbit badge to README.md (#92)

📝 Add CodeRabbit badge to `README.md`.

Author: NatoBoram

README.md

@@ -1,6 +1,6 @@
 # `@coderabbitai/openai-chat-tokens`
 
-[![GitHub Pages](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/github-pages.yaml/badge.svg)](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/github-pages.yaml) [![Node.js CI](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/node.js.yaml/badge.svg)](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/node.js.yaml) [![GitHub Downloads](https://img.shields.io/github/downloads/coderabbitai/openai-chat-tokens/total?logo=github)](https://github.com/coderabbitai/openai-chat-tokens/releases) [![NPM Downloads](https://img.shields.io/npm/dt/%40coderabbitai/openai-chat-tokens?logo=npm)](https://www.npmjs.com/package/@coderabbitai/openai-chat-tokens)
+[![GitHub Pages](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/github-pages.yaml/badge.svg)](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/github-pages.yaml) [![Node.js CI](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/node.js.yaml/badge.svg)](https://github.com/coderabbitai/openai-chat-tokens/actions/workflows/node.js.yaml) [![GitHub Downloads](https://img.shields.io/github/downloads/coderabbitai/openai-chat-tokens/total?logo=github)](https://github.com/coderabbitai/openai-chat-tokens/releases) [![NPM Downloads](https://img.shields.io/npm/dt/%40coderabbitai/openai-chat-tokens?logo=npm)](https://www.npmjs.com/package/@coderabbitai/openai-chat-tokens) ![CodeRabbit Pull Request Reviews](https://img.shields.io/coderabbit/prs/github/coderabbitai/openai-chat-tokens?labelColor=171717&color=FF570A&link=https%3A%2F%2Fcoderabbit.ai&label=CodeRabbit%20Reviews)
 
 A TypeScript / JavaScript library for estimating the number of tokens an OpenAI chat completion request will use.