python-lxml: bump to version 4.0.0

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/python-lxml/python-lxml.hash

@@ -1,2 +1,2 @@
 # Locally computed
-sha256  59d9176360dbc3919e9d4bfca85c1ca64ab4f4ee00e6f119d7150ba887e3410a  lxml-3.7.2.tgz
+sha256  f7bc9f702500e205b1560d620f14015fec76dcd6f9e889a946a2ddcc3c344fd0  lxml-4.0.0.tgz

package/python-lxml/python-lxml.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-PYTHON_LXML_VERSION = 3.7.2
+PYTHON_LXML_VERSION = 4.0.0
 PYTHON_LXML_SITE = http://lxml.de/files
 PYTHON_LXML_SOURCE = lxml-$(PYTHON_LXML_VERSION).tgz