Added OpenSSL version requirement to README.

[WilliamDenniss]

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[WilliamDenniss]

I signed it!

[mbohlool]

I am not sure if this is the minimum requirement. Worth mentioning this is on mac. What we know is, the client does not work with current OPENSSL_VERSION default on osx.

[WilliamDenniss]

Ah ok, should I make this a macOS-specific instruction then? If so, I'd mention using brew as well.

[mbohlool]

Yes, that's more appropriate I think. Thanks.

[mbohlool]

@WilliamDenniss Hey William, are you going to update this PR? I can send another one to fix it if you don't have time.

[codecov-io]

Codecov Report

Merging #147 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #147   +/-   ##
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  Coverage   94.46%   94.46%           
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  Files           9        9           
  Lines         668      668           
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  Hits          631      631           
  Misses         37       37

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