python-lxml: bump to version 3.6.4

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-lxml/python-lxml.hash

@@ -1,2 +1,2 @@
 # Locally computed
-sha256  9c74ca28a7f0c30dca8872281b3c47705e21217c8bc63912d95c9e2a7cac6bdf  lxml-3.6.0.tgz
+sha256  61d5d3e00b5821e6cda099b3b4ccfea4527bf7c595e0fb3a7a760490cedd6172  lxml-3.6.4.tgz

package/python-lxml/python-lxml.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-PYTHON_LXML_VERSION = 3.6.0
+PYTHON_LXML_VERSION = 3.6.4
 PYTHON_LXML_SITE = http://lxml.de/files
 PYTHON_LXML_SOURCE = lxml-$(PYTHON_LXML_VERSION).tgz