Mention changelog entries in contributing docs

Mention changelog entries in contributing docs

From 695332f374ddb3a9ed33b3fe6a1fbd63a36d9c9c Mon Sep 17 00:00:00 2001
From: Ben Langfeld <blangfeld@powerhrg.com>
Date: Thu, 29 Nov 2018 20:21:54 -0200
Subject: [PATCH] Mention changelog entries in contributing docs


diff --git a/README.md b/README.md
index 0e40018..b45afcf 100644
--- a/README.md
+++ b/README.md
@@ -564,6 +564,8 @@ If you are looking to contribute to this project here are some ideas
 - Make MessageBus a nice website
 - Add optional transports for websocket and shared web workers
 
+When submitting a PR, please be sure to include notes on it in the `Unreleased` section of the changelog, but do not bump the version number.
+
 ### Running tests
 
 To run tests you need both Postgres and Redis installed. By default on Redis the tests connect to `localhost:6379` and on Postgres connect the database `localhost:5432/message_bus_test` with the system username; if you wish to override this, you can set alternative values:

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