Want to know what I did?
Nothing. That's what.
Most people tend to freak out after every new Google update and alter their strategies and SEO efforts immediately to try and get back their lost rankings (usually in a big way).
You know what stands out? Someone who drastically changes what they've been doing for ages.
Sure, sometimes you need to adjust your linkbuilding methods, on-page SEO and so forth, I agree with that. But what I'm saying is that HUGE changes are hardly EVER necessary if you've been doing SEO properly since the beginning.
If your site got hit, wait it out for another week or two and see what happens. Maybe it pops back. If it doesn't, ONLY THEN do you start making SMALL adjustments to your SEO methods.
Write down what you do and keep track of how whatever you do or don't do influence your rankings. Minimize the usage of automation tools after and during an update.