docs: improve the README like other adapter repos 3

README.md

@@ -1,8 +1,8 @@
 jcasbin-mongodb-adapter
 ===
-[![codebeat badge](https://codebeat.co/badges/df265133-60a0-4ee7-b57d-25fd27273905)](https://codebeat.co/projects/github-com-jcasbin-mongodb-adapter-master)
-[![build](https://github.com/casbin/jcasbin-mongodb-adapter/actions/workflows/maven-ci.yml/badge.svg)](https://github.com/casbin/jcasbin-mongodb-adapter/actions/workflows/maven-ci.yml)
-[![codecov](https://codecov.io/gh/casbin/jcasbin-mongodb-adapter/branch/master/graph/badge.svg)](https://codecov.io/gh/casbin/jcasbin-mongodb-adapter)
+[![codebeat badge](https://codebeat.co/badges/df265133-60a0-4ee7-b57d-25fd27273905)](https://codebeat.co/projects/github-com-jcasbin-mongo-adapter-master)
+[![build](https://github.com/casbin/jcasbin-mongo-adapter/actions/workflows/maven-ci.yml/badge.svg)](https://github.com/casbin/jcasbin-mongo-adapter/actions/workflows/maven-ci.yml)
+[![codecov](https://codecov.io/gh/casbin/jcasbin-mongo-adapter/branch/master/graph/badge.svg)](https://codecov.io/gh/casbin/jcasbin-mongo-adapter)
 [![javadoc](https://javadoc.io/badge2/org.casbin/jcasbin-mongo-adapter/javadoc.svg)](https://javadoc.io/doc/org.casbin/jcasbin-mongo-adapter)
 [![Maven Central](https://img.shields.io/maven-central/v/com.github.zzl221000/jcasbin-mongo-adapter.svg)](https://mvnrepository.com/artifact/com.github.zzl221000/jcasbin-mongo-adapter/latest)
 [![Discord](https://img.shields.io/discord/1022748306096537660?logo=discord&label=discord&color=5865F2)](https://discord.gg/S5UjpzGZjN)