Update README.md

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Author: FourierTransformer

README.md

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 # lua-simdjson (WIP)
-![Build Status](https://github.com/FourierTransformer/lua-simdjson/actions/workflows/ci.yml/badge.svg?branch=master)
+[![Build Status](https://github.com/FourierTransformer/lua-simdjson/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/FourierTransformer/lua-simdjson/actions?query=branch%3Amaster)
 
 A basic lua binding to [simdjson](https://simdjson.org). The simdjson library is an incredibly fast JSON parser that uses SIMD instructions and fancy algorithms to parse JSON very quickly. It's been tested with LuaJIT 2.0/2.1 and Lua 5.1, 5.2, 5.3, and 5.4 on linux/osx. It has a general parsing mode and a lazy mode that uses a JSON pointer.