Update to SSLyze 2.0.0, and detect TLS 1.3 0-RTT

[konklone]

Just released yesterday: https://github.com/nabla-c0d3/sslyze/releases/tag/2.0.0

Featuring final-RFC TLS 1.3 support, and beta support for 0-RTT mode (early data):

• Dropped support for Python 2 and older versions of Python 3; only Python 3.6 and 3.7 are supported.
• Future releases with only support the latest two versions of Python available at the time of the release.
• Added support for the final/official release of TLS 1.3 (RFC 8446).
• The plugin can be tested against Cloudflare: python -m sslyze --tls_1_3 www.cloudflare.com
• Added beta support for TLS 1.3 early data (0-RTT) testing; see --early_data and EarlyDataScanCommand.
• The plugin can be tested against Cloudflare: python -m sslyze --early_data www.cloudflare.com