Update .gitignore

Ignores VOLUMES folder created by test suite `ldapsearch database from created volumes`
diff --git a/.gitignore b/.gitignore
index fa85192..6b3fce7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /.*
-!/.git*
\ No newline at end of file
+!/.git*
+/VOLUMES