Add dependabot announcements

Change-Id: Ib678ded4bd5e4368ac90dcdf973a0d05b6d889db
diff --git a/.gitignore b/.gitignore
index 7bb9600..06c2059 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@
 *.old
 .*
 db
+!/.github
 sandbox
 todo.org
 Kalamar-Plugin-ExternalResources