Test with python 3.9

[cursorius-cursor]

I tested your App and discovered some issues:

1. broken Link: https://waffle.io/uralbash/pyramid_pages

2. in routes.py

   old: if pyramid_version >= pkg_resources.SetuptoolsVersion('1.6a1'):
   new: if pyramid_version >= pkg_resources.parse_version('1.6a1'):

3. in pyramid_pages_example Line 30ff

   #from zope.sqlalchemy import ZopeTransactionExtension
   from zope.sqlalchemy import register

4. in pyramid_pages_example Line 131ff

   old: fixtures = json.loads(file.read(), encoding='utf-8')
   new: fixtures = json.loads(file.read())

After this changes I could start the exampel with python 3.9.

Best regards

Peter