fix promtail link (#36)

Reviewed-on: #36
Co-authored-by: fedy95 <fedy95@protonmail.com>
Co-committed-by: fedy95 <fedy95@protonmail.com>

README.md

@@ -11,7 +11,7 @@
 - [node_exporter](https://github.com/prometheus/node_exporter)
 - [prometheus](https://github.com/prometheus/prometheus)
 - [vmware_exporter](https://hub.docker.com/r/pryorda/vmware_exporter)
-- [promtail](hhttps://hub.docker.com/r/grafana/promtail)
+- [promtail](https://hub.docker.com/r/grafana/promtail)
 - [pushgateway](https://github.com/prometheus/pushgateway)
 - smartctl