RecursionError creates Python >=3.5 dependency

[itegebo]

In core/util, it's assumed that all Python 3's have this exception type, but it was actually introduced in 3.5. The result is that importing holoviews throws an exception:

.../lib/python3.4/site-packages/holoviews/core/util.py in <module>()
    237     long = int
    238     generator_types = (zip, range, types.GeneratorType)
--> 239     RecursionError = RecursionError # noqa
    240 else:
    241     basestring = basestring

NameError: name 'RecursionError' is not defined

[philippjfr]

Thanks, would be very happy to accept a PR to fix this as I can't promise how soon I'll get to it.

[github-actions]

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