Update parent pom to released version

Author: agudian

pom.xml

@@ -1,12 +1,11 @@
 <?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">
   <modelVersion>4.0.0</modelVersion>
 
   <parent>
     <groupId>org.codehaus.plexus</groupId>
     <artifactId>plexus</artifactId>
-    <version>4.0-SNAPSHOT</version>
+    <version>4.0</version>
     <relativePath>../pom/pom.xml</relativePath>
   </parent>