Bump used gerrit API to version 2.7-SNAPSHOT

Change-Id: Iea41feb175b56fee6aaf0e0123b9c0b05699ce02

pom.xml

diff --git a/pom.xml b/pom.xml
index d823d18..dc3c315 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@
 
   <groupId>com.googlesource.gerrit.plugins.bugzilla</groupId>
   <artifactId>hooks-bugzilla</artifactId>
-  <version>2.6-SNAPSHOT</version>
+  <version>2.7-SNAPSHOT</version>
 
   <name>Gerrit - Bugzilla support</name>