add webbhook to function types

Author: Maciej Winnicki

README.md

@@ -66,7 +66,7 @@ Discover and call serverless functions from anything that can reach the Event Ga
 following function types:
 
 - FaaS functions (AWS Lambda, Google Cloud Functions, Azure Functions, OpenWhisk Actions)
-- HTTP endpoints (e.g. GET http://example.com/function)
+- HTTP endpoints/Webhook (e.g. POST http://example.com/function)
 
 Function Discovery stores information about functions allowing the Eveng Gateway to call them as a reaction to received
 event.