[maven-release-plugin] prepare release sketches-core-0.13.4

pom.xml

@@ -9,7 +9,7 @@
     <groupId>com.yahoo.datasketches</groupId>
     <artifactId>sketches-core</artifactId>
     <packaging>jar</packaging> <!-- jar is the default -->
-    <version>0.13.4-SNAPSHOT</version>
+    <version>0.13.4</version>
 
     <name>${project.groupId}:${project.artifactId}</name>
     <description>Core sketch algorithms used alone and by other repositories in the DataSketches library.</description>
@@ -103,7 +103,7 @@
         <connection>scm:git:ssh://[email protected]/DataSketches/sketches-core.git</connection>
         <developerConnection>scm:git:ssh://[email protected]/DataSketches/sketches-core.git</developerConnection>
         <url>https://github.com/DataSketches/sketches-core</url>
-        <tag>HEAD</tag>
+        <tag>sketches-core-0.13.4</tag>
     </scm>
 
     <issueManagement>