docs(readme): replace standard badge with neostandard (#261)

Signed-off-by: Frazer Smith <[email protected]>

README.md

@@ -5,7 +5,7 @@ A fluent API to generate JSON schemas (draft-07) for Node.js and browser. Framew
 [![view on npm](https://img.shields.io/npm/v/fluent-json-schema.svg)](https://www.npmjs.org/package/fluent-json-schema)
 [![CI](https://github.com/fastify/fluent-json-schema/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/fastify/fluent-json-schema/actions/workflows/ci.yml)
 [![Coverage Status](https://coveralls.io/repos/github/fastify/fluent-json-schema/badge.svg?branch=master)](https://coveralls.io/github/fastify/fluent-json-schema?branch=master)
-[![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
+[![neostandard javascript style](https://img.shields.io/badge/code_style-neostandard-brightgreen?style=flat)](https://github.com/neostandard/neostandard)
 
 ## Features