Prepare pom.xml to the 2.2.0 release

pom.xml

@@ -3,12 +3,12 @@
   <groupId>com.sun.winsw</groupId>
   <artifactId>winsw</artifactId>
   <packaging>pom</packaging>
-  <version>2.1.3-SNAPSHOT</version>
+  <version>2.2.0-SNAPSHOT</version>
   <name>Windows Service Wrapper (WinSW)</name>
   <url>https://github.com/kohsuke/winsw/</url>
    
   <properties>
-    <winsw.version>2.1.2</winsw.version>
+    <winsw.version>2.2.0</winsw.version>
   </properties>
   
   <licenses>