Disable TLSv1 and TLSv1.1 by default #127

TLSv1.2 was released over 10 years ago and is widely deployed.

The Alexa Top 1 Million Analysis from February 2018 shows that for the sites surveyed, the vast majority support TLSv1.2 (98.9 percent), with a mere 0.8 percent using TLSv1.0 and an even smaller percentage using TLSv1.1.

Quote from IETF Draft on Deprecating TLSv1 and TLSv1.1 from 2018

We may be able to tighten up the ciphers we're enabling by default as well as a result of this change.