Riv can't find implicit link targets (section references)

[Rom888]

Hi and thanks for the great plugin!

After updating Vim and Riv.Vim Riv cannot find implicit section references. Example:

grep
====
.. _grep1:

bla bla bla

`grep1`_ 
`grep`_

After pressing <Enter> on grep1_ it works. After pressing <Enter> on grep_ I got an error: "Riv: Could not find the link targets" Folding seems to work.