[pkg] require python >= 3.4 This avoid pip pulling a version that does not run on python2 when using a python2 environment. Since we already released some 3.27 releases in pypi, I think we should release 3.27.3 and remove releases 3.27.2, 3.27.1 and 3.27.0 from pypi.

--- a/setup.py	Thu Mar 05 09:54:49 2020 +0100
+++ b/setup.py	Tue Mar 17 13:29:08 2020 +0100
@@ -113,4 +113,5 @@
         ],
     },
     zip_safe=False,
+    python_requires=">=3.4",
 )