Switched version to 2.1.8-SNAPSHOT

git-svn-id: https://svn.apache.org/repos/asf/struts/maven/trunk@891311 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/struts2-archetype-convention/pom.xml b/struts2-archetype-convention/pom.xml
index 49a7ca8..38a1f44 100644
--- a/struts2-archetype-convention/pom.xml
+++ b/struts2-archetype-convention/pom.xml
@@ -8,7 +8,7 @@
 
   <modelVersion>4.0.0</modelVersion>
   <artifactId>struts2-archetype-convention</artifactId>
-  <version>2.1.8</version>
+  <version>2.1.8-SNAPSHOT</version>
   <name>Struts 2 Archetypes - Blank Convention</name>
 
   <scm>