Update lxml (#5330)

emmatyping · ilevkivskyi · commit 219fbf890bfb · 2018-07-07T18:16:34.000+01:00
Fixes #5329
diff --git a/test-requirements.txt b/test-requirements.txt
@@ -1,7 +1,7 @@
 flake8
 flake8-bugbear; python_version >= '3.5'
 flake8-pyi; python_version >= '3.6'
-lxml==4.1.1
+lxml==4.2.3
 psutil==5.4.0
 pytest>=3.0
 pytest-xdist>=1.18
