added logo

README.md

@@ -1,9 +1,10 @@
 # Watermill
+<img align="right" width="200" src="https://threedots.tech/watermill-io/watermill-logo.png">
+
 [![CircleCI](https://circleci.com/gh/ThreeDotsLabs/watermill/tree/master.svg?style=svg)](https://circleci.com/gh/ThreeDotsLabs/watermill/tree/master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/ThreeDotsLabs/watermill)](https://goreportcard.com/report/github.com/ThreeDotsLabs/watermill)
 [![codecov](https://codecov.io/gh/ThreeDotsLabs/watermill/branch/master/graph/badge.svg)](https://codecov.io/gh/ThreeDotsLabs/watermill)
 
-
 Watermill is a Go library for working efficiently with message streams. It is intended
 for building event driven applications, enabling event sourcing, RPC over messages,
 sagas and basically whatever else comes to your mind. You can use conventional pub/sub