check http2 support

if you are not sure if http2 is working:

echo | openssl s_client -alpn h2 -connect somedomain.lt:443 | grep -a ALPN
depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
verify return:1
depth=0 CN = somedomain.lt
verify return:1
DONE
ALPN protocol: h2

h2 means http/2 is enabled

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