Add changes.md.

Author: ioquatix

changes.md

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+# v0.10.0
+
+## Cluster Client
+
+`Async::Redis::ClusterClient` is a new class that provides a high-level interface to a Redis Cluster. Due to the way clustering works, it does not provide the same interface as the `Async::Redis::Client` class. Instead, you must request an appropriate client for the key you are working with.
+
+```ruby
+endpoints = [
+	Async::Redis::Endpoint.parse("redis://redis-a"),
+	Async::Redis::Endpoint.parse("redis://redis-b"),
+	Async::Redis::Endpoint.parse("redis://redis-c"),
+]
+
+cluster_client = Async::Redis::ClusterClient.new(endpoints)
+
+cluster_client.clients_for("key") do |client|
+	puts client.get("key")
+end
+```
+
+## Sentinel Client
+
+The previous implementation `Async::Redis::SentinelsClient` has been replaced with `Async::Redis::SentinelClient`. This new class uses `Async::Redis::Endpoint` objects to represent the sentinels and the master.
+
+```ruby
+sentinels = [
+	Async::Redis::Endpoint.parse("redis://redis-sentinel-a"),
+	Async::Redis::Endpoint.parse("redis://redis-sentinel-b"),
+	Async::Redis::Endpoint.parse("redis://redis-sentinel-c"),
+]
+
+master_client = Async::Redis::SentinelClient.new(sentinels)
+slave_client = Async::Redis::SentinelClient.new(sentinels, role: :slave)
+
+master_client.session do |session|
+	session.set("key", "value")
+end
+
+slave_client.session do |session|
+	puts session.get("key")
+end
+```
+
+## Integration Tests
+
+Integration tests for Redis Cluster and Sentinel have been added, using `docker-compose` to start the required services and run the tests. These tests are not part of the default test suite and must be run separate. See the documentation in the `sentinel/` and `cluster/` directories for more information.