Python 3.10 compatibility

Version check in setup.py is not compatible with python-3.10. Reported in Fedora bugzilla:

https://bugzilla.redhat.com/show_bug.cgi?id=1897581

Traceback (most recent call last):
  File "/builddir/build/BUILD/FormEncode-1.3.1/setup.py", line 15, in <module>
    raise ImportError('Python version not supported')
ImportError: Python version not supported

Please, use a different version testing, for example:

py_version = sys.version_info[0]+sys.version_info[1]/100
if not 2.07 <= py_version < 3.0 and not 3.06 <= py_version:

[lambacck]

I have released 2.0.1 to pypi which includes the change to make setup.py work on Python 3.10. The docs have been updated to reflect that Python 3.10 support was added but a doc build hasn’t run yet on the official doc site. Once the doc build runs the details will show there

[hroncok]

For testing Python versions, use tuples with integers:

if not (2, 7) <= sys.version_info[:2] < (3, 0) and not (3, 6) <= sys.version_info[:2]:
    ...

Never floats or strings.