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

Author: jdcasey

pom.xml

@@ -8,7 +8,7 @@
   <modelVersion>4.0.0</modelVersion>
   <artifactId>plexus-archiver</artifactId>
   <name>Plexus Archiver Component</name>
-  <version>1.0-alpha-6</version>
+  <version>1.0-alpha-7-SNAPSHOT</version>
   <contributors>
     <contributor>
       <name>Dan Tran</name>