docs(README): fixes minor parenthesis style issue

Author: gppeixoto

README.md

@@ -105,7 +105,7 @@ dashboards as inspiration for your application.
 The exported metrics are:
 - `kafka_consumer_partition_delay`: number of records betweeen last record consumed successfully and the last record on kafka, by partition and topic.
 - `kafka_consumer_records_consumed_successfully`: number of records consumed successfully by this instance.
-- `kafka_consumer_endpoint_latency_histogram_seconds`: endpoint latency in seconds(insertion to elasticsearch).
+- `kafka_consumer_endpoint_latency_histogram_seconds`: endpoint latency in seconds (insertion to elasticsearch).
 
 ## Development