[maven-release-plugin] prepare release 3.1

Author: robtimus

pom.xml

@@ -21,7 +21,7 @@
 
   <groupId>com.github.robtimus</groupId>
   <artifactId>connect-sdk-java-spring-boot-starter</artifactId>
-  <version>3.1-SNAPSHOT</version>
+  <version>3.1</version>
 
   <name>connect-sdk-java-spring-boot-starter</name>
   <description>Spring Boot starter for connect-sdk-java (https://github.com/Ingenico-ePayments/connect-sdk-java/)</description>
@@ -45,7 +45,7 @@
   <scm>
     <connection>scm:git:[email protected]:robtimus/connect-sdk-java-spring-boot-starter.git</connection>
     <developerConnection>scm:git:[email protected]:robtimus/connect-sdk-java-spring-boot-starter.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>3.1</tag>
     <url>https://github.com/robtimus/connect-sdk-java-spring-boot-starter</url>
   </scm>