update readme

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added use your own SSL cert
 - Added health check endpoints
 
+### Updated
+- Updated README
+
 ## [11.0.0] - 2021-04-05
 
 ### Added

README.md

@@ -258,6 +258,15 @@ POST /update_user
 
 will return: `200` or `500` or `400` or `401`
 
+#### Optional - Health Check
+
+```html
+GET or HEAD /
+```
+- public endpoint
+
+will return: `200`
+
 ### Install
 
 ``` cargo install broker ```