added to filter func for links with spaces

[bradchesney79]

Heyo, ran into a crash when the tool finds a link like this:

https://dumbguy.com/i suck at making links.html

For whatever reason adding ' ' and \s to the ignore list didn't work for me, which is what I tried first.

[tinyjin]

Hi~ bradchesney79!

Thank you for your interest in my library.
I crawled https://dumbguy.com. but I can't faced crash error like story you told me.

That crawled result is

error: null
siteMap: undefined

If really has crash error, I want to accept your P/R.
Could you tell me a other link that can cause same errors.

[bradchesney79]

One last idea-- I suppose we could swap out URL path spaces with a URL encoded space, i.e. %20... For now I am satisfied with marking it as a bad URL...