Do not use an old version of the site plugin.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1505580 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index da433cc..3e0e6b3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -138,7 +138,6 @@
     <maven-scm.version>1.8</maven-scm.version>
     <doxiaVersion>1.1.4</doxiaVersion>
     <mavenVersion>2.2.1</mavenVersion>
-    <sitePluginVersion>3.0</sitePluginVersion>
     <mavenPluginVersion>3.2</mavenPluginVersion>
   </properties>
 
@@ -322,11 +321,6 @@
       <plugins>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-site-plugin</artifactId>
-          <version>${sitePluginVersion}</version>
-        </plugin>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-plugin-plugin</artifactId>
           <version>${mavenPluginVersion}</version>
           <configuration>