Bumping version to 2.7-SNAPSHOT

Change-Id: I514b43a6e01db6991543680ea2c7c8dd6ef6635a
diff --git a/pom.xml b/pom.xml
index 84cdec3..88fc04a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
     </parent>
 
     <artifactId>onos-yang-tools</artifactId>
-    <version>2.6.1</version>
+    <version>2.7-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <prerequisites>