Update PBM logo in README.MD file

Update PBM logo in README.MD file

Author: radoslawszulgo

README.md

@@ -1,7 +1,7 @@
 # Percona Backup for MongoDB
 [![Go Report Card](https://goreportcard.com/badge/github.com/percona/percona-backup-mongodb)](https://goreportcard.com/report/github.com/percona/percona-backup-mongodb) [![CLA assistant](https://cla-assistant.percona.com/readme/badge/percona/percona-backup-mongodb)](https://cla-assistant.percona.com/percona/percona-backup-mongodb)
 
-![PBM logo](backup-mongo.jpeg)
+![PBM logo](percona-backup-for-mongodb.png)
 
 Percona Backup for MongoDB (PBM) is a distributed, low-impact solution for achieving
 consistent backups of MongoDB sharded clusters and replica sets. Percona Backup for MongoDB supports Percona Server for MongoDB and MongoDB Community Edition v5.0 and higher.