Remove unused pluginManagement entry
diff --git a/pom.xml b/pom.xml
index 216e468..bac44fd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -719,10 +719,6 @@
                     </configuration>
                 </plugin>
                 <plugin>
-                    <artifactId>maven-invoker-plugin</artifactId>
-                    <version>2.0.0</version>
-                </plugin>
-                <plugin>
                     <groupId>com.github.veithen.maven</groupId>
                     <artifactId>xjc-maven-plugin</artifactId>
                     <version>0.1</version>