[develop] bug fixed in pom.xml

pom.xml

@@ -325,7 +325,7 @@ xml.properties() {
           </provides>
           <needarch>noarch</needarch>
           <postinstallScriptlet>
-            <script><![CDATA[ echo -e "<?xml version='1.0' encoding='utf-8'?>\n<properties>\n\t<github_repository version='\${project.version}'>\${project.artifactId}</github_repository>\n</properties>" > /application/properties.xml ]]></script>
+            <script><![CDATA[ echo "<?xml version='1.0' encoding='utf-8'?><properties><github_repository version='${project.version}'>${project.artifactId}</github_repository></properties>" | xmllint --format - > /application/properties.xml ]]></script>
           </postinstallScriptlet>
         </configuration>
       </plugin>