Bump to 2.2.0-SNAPSHOT.

Author: nedtwigg

README.md

@@ -16,7 +16,7 @@ output = [
 [![Maven central](https://img.shields.io/badge/mavencentral-com.diffplug.gradle.spotless%3Aspotless-blue.svg)](http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22com.diffplug.gradle.spotless%22%20AND%20a%3A%22spotless%22)
 [![Javadoc](https://img.shields.io/badge/javadoc-2.1.0-blue.svg)](https://diffplug.github.io/spotless/javadoc/2.1.0/)
 
-[![Changelog](https://img.shields.io/badge/changelog-2.1.0-brightgreen.svg)](CHANGES.md)
+[![Changelog](https://img.shields.io/badge/changelog-2.2.0--SNAPSHOT-brightgreen.svg)](CHANGES.md)
 [![Travis CI](https://travis-ci.org/diffplug/spotless.svg?branch=master)](https://travis-ci.org/diffplug/spotless)
 [![Live chat](https://img.shields.io/badge/gitter-chat-brightgreen.svg)](https://gitter.im/diffplug/spotless)
 [![License Apache](https://img.shields.io/badge/license-apache-brightgreen.svg)](https://tldrlegal.com/license/apache-license-2.0-(apache-2.0))

gradle.properties

@@ -1,5 +1,5 @@
 stable=2.1.0
-version=2.1.0
+version=2.2.0-SNAPSHOT
 name=spotless
 group=com.diffplug.gradle.spotless
 description=Spotless - keep your code spotless with Gradle