[maven-release-plugin] prepare release 5.2.0

pom.xml

@@ -7,12 +7,12 @@
     <groupId>org.exist-db</groupId>
     <artifactId>exist-apps-parent</artifactId>
     <version>1.9.1</version>
-    <relativePath/>
+    <relativePath />
   </parent>
 
   <groupId>org.exist-db</groupId>
   <artifactId>exist-documentation</artifactId>
-  <version>5.1.1-SNAPSHOT</version>
+  <version>5.2.0</version>
 
   <name>eXist-db Documentation</name>
   <description>Documentation package for eXist-db</description>
@@ -36,7 +36,7 @@
     <url>https://www.github.com/exist-db/documentation.git</url>
     <connection>scm:git:https://www.github.com/exist-db/documentation.git</connection>
     <developerConnection>scm:git:https://www.github.com/exist-db/documentation.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>5.2.0</tag>
   </scm>
   <issueManagement>
     <system>GitHub</system>