PDFBOX-5660: update shade plugin

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1928416 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

parent/pom.xml

@@ -256,7 +256,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-shade-plugin</artifactId>
-                    <version>3.6.0</version>
+                    <version>3.6.1</version>
                 </plugin>
             </plugins>
         </pluginManagement>