docs: add bronze sponsor and add sponsor widgets to README

Author: mtrezza

README.md

@@ -5,11 +5,11 @@
 [![Build Status](https://github.com/parse-community/parse-server/workflows/ci/badge.svg?branch=alpha)](https://github.com/parse-community/parse-server/actions?query=workflow%3Aci+branch%3Aalpha)
 [![Snyk Badge](https://snyk.io/test/github/parse-community/parse-server/badge.svg)](https://snyk.io/test/github/parse-community/parse-server)
 [![Coverage](https://img.shields.io/codecov/c/github/parse-community/parse-server/alpha.svg)](https://codecov.io/github/parse-community/parse-server?branch=alpha)
+[![auto-release](https://img.shields.io/badge/%F0%9F%9A%80-auto--release-9e34eb.svg)](https://github.com/parse-community/parse-dashboard/releases)
 
 [![Node Version](https://img.shields.io/badge/nodejs-12,_14,_15-green.svg?logo=node.js&style=flat)](https://nodejs.org)
 [![MongoDB Version](https://img.shields.io/badge/mongodb-4.0,_4.2,_4.4,_5.0-green.svg?logo=mongodb&style=flat)](https://www.mongodb.com)
 [![Postgres Version](https://img.shields.io/badge/postgresql-11,_12,_13,_14-green.svg?logo=postgresql&style=flat)](https://www.postgresql.org)
-[![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-server/latest.svg)](https://www.npmjs.com/package/parse-server)
 [![npm beta version](https://img.shields.io/npm/v/parse-server/beta.svg)](https://www.npmjs.com/package/parse-server)
@@ -29,11 +29,15 @@ The full documentation for Parse Server is available in the [wiki](https://githu
 
 ---
 
-A big *thank you* to all our backers and sponsors who support the development of Parse Platform!
+A big *thank you* 🙏 to all our backers and sponsors who support the development of Parse Platform!
 
-### 💎 Diamond Sponsors
-    
-[![Sponsor](https://opencollective.com/parse-server/sponsor/0/avatar.svg)](https://opencollective.com/parse-server/sponsor/0/website)
+### Diamond Sponsors
+
+![Diamond Sponsors](https://opencollective.com/parse-server/tiers/diamond-sponsor.svg?avatarHeight=70&button=false)
+
+#### Bronze Sponsors
+
+![Bronze Sponsors](https://opencollective.com/parse-server/tiers/bronze-sponsor.svg?avatarHeight=36&button=false)
 
 ---