WIP: Require newer lxml (4.8)

setup.py

@@ -155,9 +155,10 @@ def setup_package():
         author='Henrik tom Wörden',
         author_email='h.tomwoerden@indiscale.com',
         install_requires=["caosdb>=0.7.0",
+                          "lxml>=4.8.0"
+                          "numpy>=1.17.3",
                           "openpyxl>=3.0.0",
                           "pandas>=1.2.0",
-                          "numpy>=1.17.3",
                           "xlrd>=2.0",
                           ],
         extras_require={"h5-crawler": ["h5py>=3.3.0", ],