[HTTPS-E Rulesets] xkcd: what-if is broken

[Christopher Liu]

To whom it may concern:

It appears that what-if.xkcd.com moved to the Voxel CDN and thus broke.
>From my knowledge of other Voxel buckets, it would not be functional
even with a cert exception, hence no "mismatches" ruleset to write.

Comment: CDN buckets:
- 2930-xkcdimgs.voxcdn.com
    - imgs.xkcd.com
- 2930-whatif.voxcdn.com
    - what-if.xkcd.com

C. Liu