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

pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>com.englishtown</groupId>
     <artifactId>stash-hook-mirror</artifactId>
-    <version>3.0.0</version>
+    <version>3.1.0-SNAPSHOT</version>
 
     <organization>
         <name>Englishtown</name>
@@ -139,7 +139,7 @@
         <connection>scm:git:git@github.com:ef-labs/stash-hook-mirror.git</connection>
         <developerConnection>scm:git:git@github.com:ef-labs/stash-hook-mirror.git</developerConnection>
         <url>https://github.com/ef-labs/stash-hook-mirror</url>
-        <tag>3.0.0</tag>
+        <tag>HEAD</tag>
     </scm>
 
     <distributionManagement>