[maven-release-plugin] prepare release v1.0.0-RC1

pom.xml

@@ -1,10 +1,9 @@
 <?xml version="1.0"?>
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.spdx</groupId>
   <artifactId>spdx-java-model-3_0</artifactId>
-  <version>1.0.0-RC1-SNAPSHOT</version>
+  <version>1.0.0-RC1</version>
   <name>spdx-java-model-3</name>
   <description>Generated java model source code</description>
   <url>https://github.com/spdx/spdx-java-model-3_0</url>
@@ -32,6 +31,7 @@
     <connection>scm:git:git://github.com/spdx/spdx-java-model-3_0.git</connection>
     <developerConnection>scm:git:[email protected]:spdx/spdx-java-model-3_0.git</developerConnection>
     <url>https://github.com/spdx/spdx-java-model-3_0</url>
+    <tag>v1.0.0-RC1</tag>
   </scm>
   <distributionManagement>
     <repository>