Increment snapshot version

Change from 1.5.0-SNAPSHOT to 1.6.0-SNAPSHOT to prepare
for next development cycle.

Change-Id: I187785ab4b11a37815289d20ba802c48e86cee7f
Signed-off-by: Patrick Brady <patrick.brady@att.com>
Issue-ID: APPC-1585
diff --git a/appc-inbound/appc-interfaces-service/model/pom.xml b/appc-inbound/appc-interfaces-service/model/pom.xml
index 382da30..8a4fbfc 100644
--- a/appc-inbound/appc-interfaces-service/model/pom.xml
+++ b/appc-inbound/appc-interfaces-service/model/pom.xml
@@ -174,5 +174,5 @@
             <artifactId>ietf-yang-types-20130715</artifactId>
             </dependency>
     </dependencies>
-    <version>1.5.0-SNAPSHOT</version>
+    <version>1.6.0-SNAPSHOT</version>
 </project>