The extra/httpd-ssl.conf file shipped with Apache httpd 2.4.20 says
By the end of 2016, only the TLSv1.2 protocol or later should remain
SSLProtocol -all +TLSv1.2
SSLProtocol all -SSLv3 -TLSv1
SSLProxyProtocol all -SSLv3 -TLSv1
TLS 1.3 is not yet released, so, for now:
SSLProtocol -all +TLSv1.2 SSLProxyProtocol -all +TLSv1.2
is all that you need.
If you want to support "later" in a more flexible way, just do:
SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1 SSLProxyProtocol all -SSLv3 -TLSv1 -TLSv1.1
For Apache 2.4, these are the only protocols supported.