aho-corasick 0.7

[ignatenkobrain]

Hello,

it would be great if you'd update aho-corasick dependency to 0.7. It was rewritten by @BurntSushi in BurntSushi/aho-corasick@e8493ba

[BurntSushi]

Yes, I maintain the regex crate too. :-)

It just so happens that this time, upgrading should hopefully be fairly easy and it's next on my TODO list, but that may not always be the case.

[BurntSushi]

Fixed in #566