Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit cf138be9b4.

Mustang-CLI/pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.13.1-SNAPSHOT</version>
+        <version>2.13.0</version>
     </parent>
 
     <artifactId>Mustang-CLI</artifactId>

library/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.13.1-SNAPSHOT</version>
+        <version>2.13.0</version>
     </parent>
     <artifactId>library</artifactId>
     <packaging>jar</packaging>

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
     <artifactId>core</artifactId>
-    <version>2.13.1-SNAPSHOT</version>
+    <version>2.13.0</version>
     <packaging>pom</packaging>
     <name>Mustang</name>
 
@@ -83,7 +83,7 @@
         <connection>scm:git:https://github.com/ZUGFeRD/mustangproject.git</connection>
         <developerConnection>scm:git:https://github.com/ZUGFeRD/mustangproject.git</developerConnection>
         <url>https://github.com/ZUGFeRD/mustangproject</url>
-      <tag>HEAD</tag>
+      <tag>core-2.13.0</tag>
   </scm>
 
     <distributionManagement>

validator/pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.13.1-SNAPSHOT</version>
+        <version>2.13.0</version>
     </parent>
     
     <artifactId>validator</artifactId>