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Use curl with HTTP/2 on macOS

If you'll try to run curl with --http2 flag with curl shipped with macOS by default (as of macOS 10.12) you'll get the following error:

curl -I --http2 https://http2.akamai.com/
curl: (1) Unsupported protocol

To fix that you can reinstall curl using brew with --with-nghttp2 flag and replace the standard curl with newly installed:

brew install curl --with-nghttp2
brew link curl --force

and after you restart your terminal:

curl -I --http2 https://http2.akamai.com/
HTTP/2 200
server: Apache
...