[pkg] add python3 only pypi specifiers
This is only for pypi statistics purposes.
Also add 'Programming Language :: Python', looks obvious but seems to be sane to have this as well.
--- a/cubicweb/__pkginfo__.py Tue Mar 17 13:30:50 2020 +0100
+++ b/cubicweb/__pkginfo__.py Tue Mar 17 13:31:50 2020 +0100
@@ -34,7 +34,9 @@
classifiers = [
'Environment :: Web Environment',
'Framework :: CubicWeb',
+ 'Programming Language :: Python',
'Programming Language :: Python :: 3',
+ 'Programming Language :: Python :: 3 :: Only',
'Programming Language :: JavaScript',
]