readme: add Loki output
/close
@@ -155,6 +155,7 @@ Fluent Bit is fully supported on Windows environments, get started with [these i
| [influxdb](https://docs.fluentbit.io/manual/pipeline/outputs/influxdb) | InfluxDB | Flush records to InfluxDB time series database. |
| [kafka](https://docs.fluentbit.io/manual/pipeline/outputs/kafka) | Apache Kafka | Flush records to Apache Kafka |
| [kafka-rest](https://docs.fluentbit.io/manual/pipeline/outputs/kafka-rest-proxy) | Kafka REST Proxy | Flush records to a Kafka REST Proxy server. |
+| [loki](https://docs.fluentbit.io/manual/pipeline/outputs/loki) | Loki | Flush records to Loki server. |
| [nats](https://docs.fluentbit.io/manual/pipeline/outputs/nats) | NATS | Flush records to a NATS server. |
| [null](https://docs.fluentbit.io/manual/pipeline/outputs/null) | NULL | Throw away events. |
| [s3](https://docs.fluentbit.io/manual/pipeline/outputs/s3) | S3 | Flush records to s3 |
