[whatwg/fetch] Consider adding SMB to port blacklist (#544)

Please consider adding the ports used for Microsoft's SMB protocol (139, 445) to the "bad port" blacklist.  This is prompted by the [MS17-010](https://github.com/RiskSense-Ops/MS17-010) exploit, but there's quite a long history of remotely exploitable SMB bugs.  This will, at least, make it harder to [scan for exploitable systems](http://www.andlabs.org/tools/jsrecon/jsrecon.html) from a malicious website.

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