Bump version to 2.2.0.

Update README.

Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
 	<PropertyGroup>
 		<AssemblyVersion>2.2.0.0</AssemblyVersion>
-		<Version>2.2.0-pre1</Version>
+		<Version>2.2.0</Version>
 		<FileVersion>$(Version)</FileVersion>
 		<Authors>Sam Cook</Authors>
 		<Company />
@@ -14,6 +14,8 @@
 		<RepositoryType>git</RepositoryType>
 		<PackageTags>RedLock Redis Distributed Lock</PackageTags>
 		<PackageReleaseNotes>
+			Note: RedLock 2.2.0+ requires StackExchange.Redis 2.0+ - if you need to use StackExchange.Redis 1.x please continue to use RedLock.net 2.1.0.
+
 			2.2.0 - Update to StackExchange.Redis 2.0. Switch to a single strong named package and adjust platform targets to match StackExchange.Redis 2.0.
 			2.1.0 - Add connection change events and more detailed lock status information
 			2.0.0 - .NET Core release

README.md

@@ -1,13 +1,17 @@
-# RedLock.net [![Build status](https://ci.appveyor.com/api/projects/status/fclfbkdqy905v3xu/branch/master?svg=true)](https://ci.appveyor.com/project/samcook/redlock-net/branch/master)
+# RedLock.net
+
+[![Build status](https://ci.appveyor.com/api/projects/status/fclfbkdqy905v3xu/branch/master?svg=true)](https://ci.appveyor.com/project/samcook/redlock-net/branch/master) [![GitHub](https://img.shields.io/github/license/samcook/RedLock.net.svg)](LICENSE) [![NuGet](https://img.shields.io/nuget/dt/RedLock.net.svg)](https://www.nuget.org/packages/RedLock.net) [![GitHub release](https://img.shields.io/github/release/samcook/RedLock.net.svg?logo=github&logoColor=cccccc)](https://github.com/samcook/RedLock.net/releases) [![GitHub release](https://img.shields.io/github/release/samcook/RedLock.net/all.svg?label=pre-release&logo=github&logoColor=cccccc)](https://github.com/samcook/RedLock.net/releases)
 
 An implementation of the [Redlock distributed lock algorithm](http://redis.io/topics/distlock) in C#.
 
-Makes use of the excellent [StackExchange.Redis](https://github.com/StackExchange/StackExchange.Redis) library.
+Makes use of the excellent [StackExchange.Redis](https://stackexchange.github.io/StackExchange.Redis/) library.
 
 Distributed locks are useful for ensuring only one process is using a particular resource at any given time (even if the processes are running on different machines).
 
 RedLock.net is available using NuGet - search for [RedLock.net](https://www.nuget.org/packages/RedLock.net).
 
+*Note:* RedLock 2.2.0+ requires StackExchange.Redis 2.0+ - if you need to use StackExchange.Redis 1.x please continue to use RedLock.net 2.1.0.
+
 ## Usage
 
 Construct a `RedLockFactory`, passing in a set of Redis endpoints. Each endpoint passed to the constructor should be independent (i.e. not replicated masters/slaves). See below for more information on using RedLock.net with replicated instances.