About HTTP/2 via +John Mueller​​ from Google:

#HTTP/2 has no impact on SEO! Search engine crawlers (even if they don't support HTTP/2 yet, like Googlebot) will continue to work normally, you don't have to set up redirects, change links, add markup, or make any changes in Search Console.

# Most browsers only support #HTTP2 together with #HTTPS. That's when users will usually see improvements. Already on HTTPS? Awesome, you're all set.

# HTTP/2 is ready for use now, and supported in lots of website server setups.

Curious about more? Check out these links:

# http://hpbn.co/http2
# https://http2.github.io/faq
# https://en.wikipedia.org/wiki/HTTP/2