🔥 Remove Circle badge

We aren't using CircleCI anymore, so remove badge.

README.md

@@ -1,6 +1,5 @@
 [![npm](https://img.shields.io/npm/v/effection.svg)](https://www.npmjs.com/package/effection)
 [![bundle size (minified + gzip)](https://img.shields.io/bundlephobia/minzip/effection)](https://bundlephobia.com/result?p=effection)
-[![CircleCI](https://circleci.com/gh/thefrontside/effection.svg?style=shield)](https://circleci.com/gh/thefrontside/effection)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Created by Frontside](https://img.shields.io/badge/created%20by-frontside-26abe8.svg)](https://frontside.com)
 [![Chat on Discord](https://img.shields.io/discord/700803887132704931?Label=Discord)](https://discord.gg/Ug5nWH8)