Rename master branch to main

readme.md

@@ -12,7 +12,7 @@
 
 > Ky is a tiny and elegant HTTP client based on the browser [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch)
 
-[![Coverage Status](https://codecov.io/gh/sindresorhus/ky/branch/master/graph/badge.svg)](https://codecov.io/gh/sindresorhus/ky)
+[![Coverage Status](https://codecov.io/gh/sindresorhus/ky/branch/main/graph/badge.svg)](https://codecov.io/gh/sindresorhus/ky)
 [![](https://badgen.net/bundlephobia/minzip/ky)](https://bundlephobia.com/result?p=ky)
 
 Ky targets [modern browsers](#browser-support) and [Deno](https://github.com/denoland/deno). For older browsers, you will need to transpile and use a [`fetch` polyfill](https://github.com/github/fetch). For Node.js, check out [Got](https://github.com/sindresorhus/got). For isomorphic needs (like SSR), check out [`ky-universal`](https://github.com/sindresorhus/ky-universal).