add dateutil version requirement

project uses isoparse that was added in 2.7.0

setup.py

@@ -14,7 +14,7 @@
     install_requires=[
         "odoorpc==0.7.0",
         "requests_toolbelt==0.8.0",
-        "python-dateutil",
+        "python-dateutil>=2.7.0",
         # How to indicate to install python3-docker?
     ],
     entry_points={