docs: Remove beta badge (#2473)

Author: mtrezza

README.md

@@ -11,7 +11,6 @@
 [![auto-release](https://img.shields.io/badge/%F0%9F%9A%80-auto--release-9e34eb.svg)](https://github.com/parse-community/parse-dashboard/releases)
 
 [![npm latest version](https://img.shields.io/npm/v/parse/latest.svg)](https://www.npmjs.com/package/parse)
-[![npm beta version](https://img.shields.io/npm/v/parse/beta.svg)](https://www.npmjs.com/package/parse)
 [![npm alpha version](https://img.shields.io/npm/v/parse/alpha.svg)](https://www.npmjs.com/package/parse)
 
 [![Backers on Open Collective](https://opencollective.com/parse-server/backers/badge.svg)][open-collective-link]