Register the BatchModule

This way the BatchModule will be used during offline reindexing.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I79eb21be19227e8eaa74e8a6f162e77ee72bd158

BUILD

diff --git a/BUILD b/BUILD
index 506abaa..7c7f9e0 100644
--- a/BUILD
+++ b/BUILD
@@ -20,6 +20,7 @@
         "Gerrit-PluginName: code-owners",
         "Gerrit-Module: com.google.gerrit.plugins.codeowners.module.Module",
         "Gerrit-HttpModule: com.google.gerrit.plugins.codeowners.module.HttpModule",
+        "Gerrit-BatchModule: com.google.gerrit.plugins.codeowners.module.BatchModule",
     ],
     resource_jars = [":code-owners-fe-static"],
     resource_strip_prefix = "plugins/code-owners/resources",