DB cannot be populated using python3

[cmoulliard]

Issue

The cmd initialize_github2fedmsg_db development.ini generates the following error using python3

Traceback (most recent call last):
  File "/Users/cmoullia/.venv/bin/initialize_github2fedmsg_db", line 33, in <module>
    sys.exit(load_entry_point('github2fedmsg', 'console_scripts', 'initialize_github2fedmsg_db')())
  File "/Users/cmoullia/.venv/bin/initialize_github2fedmsg_db", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/local/Cellar/python@3.8/3.8.6_2/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/usr/local/Cellar/python@3.8/3.8.6_2/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 779, in exec_module
  File "<frozen importlib._bootstrap_external>", line 916, in get_code
  File "<frozen importlib._bootstrap_external>", line 846, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/cmoullia/temp/jenkins/github2fedmsg/github2fedmsg/__init__.py", line 51
    print "Reading secrets from %r" % secret_path
          ^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print("Reading secrets from %r" % secret_path)?