dev-python/lxml: revision bump to 3.6.4-r1

Package-Manager: portage-2.3.0
Closes: https://github.com/gentoo/gentoo/pull/2539

Signed-off-by: David Seifert <soap@gentoo.org>

diff --git a/dev-python/lxml/lxml-3.6.4.ebuild b/dev-python/lxml/lxml-3.6.4-r1.ebuild
similarity index 100%
rename from dev-python/lxml/lxml-3.6.4.ebuild
rename to dev-python/lxml/lxml-3.6.4-r1.ebuild