ssl: add SSLContext#min_version= and #max_version= #142
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Add methods that set the minimum and maximum supported protocol
versions for the SSL context. If the OpenSSL library supports, use
SSL_CTX_set_{min,max}proto_version() that do the exact thing.
Otherwise, simulate by combining SSL_OP_NO{SSL,TLS}v* flags.
The new methods are meant to replace the deprecated
SSLContext#ssl_version= that cannot support multiple protocol versions.
SSLContext::DEFAULT_PARAMS is also updated to use the new
SSLContext#min_version=.