Removing reference to file which is not defined in Python 3

[mwatts15]

• Resolves missing documentation #33

[iherman]

(Sorry to be late with this, @mwatts15, I do not really maintain this software any more...

The problem is that the package is used at places that still use python2. Legacy software and all that. Ie, the changes you propose may not work. What about

		if (PY3 and isinstance(input, str)) or (isinstance(input, StringIO) or isinstance(input, file)) :
			parse = xml.dom.minidom.parse
		else:
			parse = xml.dom.minidom.parseString

instead?

(I can make edit the library directly or you can amend the PR; as you prefer)

Thanks

[iherman]

Closing without merge, per #39 which solved it.