0.12.1

• improved compatibility with the openssl gem (version 2.2.1)
• JOSSL now ships with a single set of openssl .rb files
  • providing compat with required_ruby_version = '>= 2.3.0'
  • flat set of .rb files at lib/openssl/ (based on openssl gem)
• revisited OpenSSL::SSL::SSLContext::DEFAULT_PARAMS defaults
  • implicit verify_hostname default .rb callback still a noop
  • TLS continues to rely on the Java SSL engine for hostname checks
• working TLS 1.3 support
• droped Java 1.7 support (at least Java 8 needed to use the gem)
• fixed SSLContext#options matches C OpenSSL (using OP_ALL)
• no longer filter out SSLv2 (for improved OpenSSL compatibility)
• implemented naive SSLContext#ciphers caching to speed-up TLS
• StoreError raised due a Java exception now retain native cause