Crawler corrections January 2017

[ajdavis]

Fix a code-wart that a reader pointed out to me, deal with xkcd.com's change to TLS-only, and acknowledge updates to Python and aiohttp since publication.

CC: @gvanrossum, but your review is not required unless you want to.

[MichaelDiBernardo]

Thanks for pinging me via email on this. Sometime in the next couple of weeks I will merge and publish a new web version; I should also be able to update the print version with these corrections (and others that have been submitted since release), but that may take awhile longer.

[Malix-Labs]

Thanks for pinging me via email on this. Sometime in the next couple of weeks I will merge and publish a new web version; I should also be able to update the print version with these corrections (and others that have been submitted since release), but that may take awhile longer.

a while, while longer

[mazhongbin]

您好：    您的来信已收到，查阅后尽快与您取得联系。

[stoic94]

这是来自QQ邮箱的自动回复邮件。   您好，我会尽快给您回复。

[jankey110]

邮件已收到了哈~会尽快给您回复~~