add back tag element otherwise release plugin create it in wrong location and spotless complains...

Signed-off-by: Olivier Lamy <olamy@apache.org>
diff --git a/pom.xml b/pom.xml
index 773e57f..07772fd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,6 +40,7 @@
   <scm>
     <connection>scm:git:https://github.com/apache/maven-build-cache-extension.git</connection>
     <developerConnection>scm:git:https://github.com/apache/maven-build-cache-extension.git</developerConnection>
+    <tag>maven-build-cache-extension-1.0.0</tag>
     <url>https://github.com/apache/maven-build-cache-extension/tree/${project.scm.tag}</url>
   </scm>
   <issueManagement>