Changing version from 1.15.0-SNAPSHOT to 2.0.0-SNAPSHOT.

Change-Id: I61a586cfc769275db78f4059a630ab0e0f87c6e7
diff --git a/tools/package/archetypes/api/pom.xml b/tools/package/archetypes/api/pom.xml
index b9add47..bef2c86 100644
--- a/tools/package/archetypes/api/pom.xml
+++ b/tools/package/archetypes/api/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.onosproject</groupId>
     <artifactId>onos-archetypes</artifactId>
-    <version>1.15.0-SNAPSHOT</version>
+    <version>2.0.0-SNAPSHOT</version>
   </parent>
 
   <artifactId>onos-api-archetype</artifactId>