Post release: bump version string for development

Change-Id: Idde4b1aef90e1e7576f55c037e3f3ccfd84fda2d
diff --git a/VERSION b/VERSION
index 42045ac..b57fd5d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.4
+0.3.5-dev