Fix deprecation warning with Python >= 3.7.

Python >= 3.7 issues a deprecation warning when using collections.Callable
rather than collections.abc.Callable.  Most of Beautiful Soup deals with
this by using a conditional import, but the automatic Python 3 conversion
apparently translates `callable(obj)` to `isinstance(obj,
collections.Callable)` which trips this deprecation warning.

`isinstance(obj, Callable)` works fine in Python 2 as well as 3, so just use
it directly.

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