README fix.

Author: Anton Kucherov

README.md

@@ -1,8 +1,11 @@
-# CloudWatch Exporter
+# RDS Exporter
 
+[![Release](https://img.shields.io/github/release/percona/rds_exporter.svg?style=flat)](https://github.com/percona/rds_exporter/releases/latest)
 [![Build Status](https://travis-ci.org/percona/rds_exporter.svg)](https://travis-ci.org/percona/rds_exporter)
 [![Go Report Card](https://goreportcard.com/badge/github.com/percona/rds_exporter)](https://goreportcard.com/report/github.com/percona/rds_exporter)
 [![CLA assistant](https://cla-assistant.percona.com/readme/badge/percona/rds_exporter)](https://cla-assistant.percona.com/percona/rds_exporter)
+[![codecov.io Code Coverage](https://img.shields.io/codecov/c/github/percona/rds_exporter.svg?maxAge=2592000)](https://codecov.io/github/percona/rds_exporter?branch=master)
+
 An [AWS RDS](https://aws.amazon.com/ru/rds/) exporter for [Prometheus](https://github.com/prometheus/prometheus).
 It gets metrics from both [basic CloudWatch Metrics](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MonitoringOverview.html)
 and [RDS Enhanced Monitoring via CloudWatch Logs](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_Monitoring.OS.html).