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

pom.xml

@@ -9,7 +9,7 @@
 
   <groupId>com.fasterxml.jackson.dataformat</groupId>
   <artifactId>jackson-dataformat-yaml</artifactId>
-  <version>2.7.8</version>
+  <version>2.7.9-SNAPSHOT</version>
   <packaging>bundle</packaging>
   <name>Jackson-dataformat-YAML</name>
   <description>Support for reading and writing YAML-encoded data via Jackson abstractions.
@@ -19,7 +19,7 @@
     <connection>scm:git:[email protected]:FasterXML/jackson-dataformat-yaml.git</connection>
     <developerConnection>scm:git:[email protected]:FasterXML/jackson-dataformat-yaml.git</developerConnection>
     <url>http://github.com/FasterXML/jackson-dataformat-yaml</url>    
-    <tag>jackson-dataformat-yaml-2.7.8</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <properties>