[VOL-5296] document voltctl release

howto/release/voltctl/release.rst
  o Add more howto release notes for voltctl
    https://docs.voltha.org/master/howto/release/voltctl/release.html

Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
Change-Id: I1675d65ac57b6cd903626a1ab56b0d36ca058170
diff --git a/VERSION b/VERSION
index ed5ed72..26340c0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.12.35
+2.12.36