Set MinVersion for TLS

[shu-mutou]

Limits TLS <= v1.1 due to security reason.

Closes: #3058

[codecov]

Codecov Report

Merging #5013 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5013   +/-   ##
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  Coverage   45.42%   45.42%           
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  Files         214      214           
  Lines       10066    10066           
  Branches       98       98           
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  Hits         4572     4572           
  Misses       5226     5226           
  Partials      268      268

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[floreks]

I think we can go with that. v1.2 is there for a while, and seem to be supported by most browsers.

https://caniuse.com/#feat=tls1-2

[floreks]

/lgtm

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