[maven-release-plugin] prepare release 0.2.1

pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
 
@@ -12,7 +11,7 @@
 
 	<groupId>com.github.davidmoten</groupId>
 	<artifactId>rtree</artifactId>
-	<version>0.3-SNAPSHOT</version>
+	<version>0.2.1</version>
 
 	<name>${project.artifactId}</name>
 	<description>Java implementation of an immutable in-memory R-Tree for spatial indexing</description>