Bump docs version for 2.1 development

Change-Id: I46062ee7d1da9401fa3bda628d341d183d77f3a9
diff --git a/VERSION b/VERSION
index 94245d2..c10edc3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.2-dev
+2.1.0-dev