Revert "Remove required version of 'epigraph'"

This reverts commit 4c6ee39761a0991e93f147151d71f965b2e433e0.

Now that TeX Live 2015/Debian with the up-to-date "epigraph" does
not suffer from the excessively wide vertical spaces, we can
revert commit 4c6ee39761a0 ("Remove required version of 'epigraph'")
and make the up-to-date epigraph mandatory.

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
3 files changed