requirements: pin lxml version for py27

anthrotype · anthrotype · commit fe1a3422bd9f · 2019-07-29T11:51:29.000+01:00
lxml 4.4.0 breaks OrderedDict attributes in py27 so we pin to previous version https://bugs.launchpad.net/lxml/+bug/1838252
diff --git a/requirements.txt b/requirements.txt
@@ -9,3 +9,7 @@ munkres==1.0.12; platform_python_implementation == "PyPy" and python_version < '
 munkres==1.1.2; platform_python_implementation == "PyPy" and python_version >= '3.5'
 zopfli==0.1.6
 fs==2.4.8
+# lxml 4.4.0 breaks OrderedDict attributes in py27 so we pin to previous version
+# https://bugs.launchpad.net/lxml/+bug/1838252
+lxml==4.3.5; python_version < '3.5'  # pyup: ignore
+lxml==4.4.0; python_version >= '3.5'
