Bumping version to 2.7-SNAPSHOT

Change-Id: I514b43a6e01db6991543680ea2c7c8dd6ef6635a
diff --git a/serializers/json/pom.xml b/serializers/json/pom.xml
index 2258dde..7ccc95d 100644
--- a/serializers/json/pom.xml
+++ b/serializers/json/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.onosproject</groupId>
         <artifactId>onos-yang-serializers</artifactId>
-        <version>2.6.1</version>
+        <version>2.7-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>