VOL-2138 return to -dev version

Change-Id: I1e65097f70a5b8e6a1601df606adbe08fdfb6b9b
diff --git a/VERSION b/VERSION
index 5bc1cc4..f091353 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.7
+2.2.8-dev