Update readme for histogram and summary opts (#96)

Update readme for histogram and summary opts (#96)

  • updated readme for histogram and summary opts

  • fixed typo

diff --git a/README.md b/README.md
index c70008c..b32b48d 100644
--- a/README.md
+++ b/README.md
@@ -149,6 +149,17 @@ awesome 10
 
 `‍``
 
+Custom quantiles for summaries and buckets for histograms can also be passed in.
+
+`‍``ruby
+require 'prometheus_exporter/client'
+
+client = PrometheusExporter::Client.default
+histogram = client.register(:histogram, "api_time", "time to call api", buckets: [0.1, 0.5, 1])
+
+histogram.observe(0.2, api: 'twitter')
+`‍``
+
 ### Rails integration
 
 You can easily integrate into any Rack application.

GitHub sha: bf56a24d