docs: Add 1904

Change-Id: Icf0e01d1dec69d48664ed633205248359b653f4d
Signed-off-by: jdenisco <jdenisco@cisco.com>
diff --git a/docs/featuresbyrelease/index.rst b/docs/featuresbyrelease/index.rst
index ca5fb16..a937c6a 100644
--- a/docs/featuresbyrelease/index.rst
+++ b/docs/featuresbyrelease/index.rst
@@ -9,6 +9,8 @@
 .. toctree::

    :maxdepth: 1

 

+   vpp1904

+   vpp1901

    vpp18.10

    vpp18.07

    vpp18.04