Detect dead arguments too

Originally reported by: Wilfred Hughes (Bitbucket: Wilfred, GitHub: Wilfred)

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It would be great if vulture could also detect unused arguments. For example, y is unused here:

#!python

def foo(x, y):
    return x + 1

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• Bitbucket: https://bitbucket.org/jendrikseipp/vulture/issue/15

[RJ722]

@lanzz you can create a whitelist file containing a variable with same name as your argument.

For example, for the program above, the whitelist will look like this:

y

[lanzz]

Sorry for bringing a long buried issue back from the dead, but is there any way to whitelist unused function arguments? It is not always possible to rename it with a leading underscore (e.g. when a callback interface passes it as a kwarg).