0.14.4

• [fix] convert OpenSSL::ASN1::Sequence to an array on #to_der (#265)
• [feat] implement PKey::DH.generate and (dummy) q reader (#254)
• [fix] raise TypeError when arg isn't a Group
• [refactor] make sure ASN1Error has native cause
• [fix] stop assuming (JDK) EC key identifier
  "EC" with Sun provider but "ECDSA" with BC
• [fix] do not check empty string as curve name
• [fix] make sure PKeyEC#group.curve_name is always set
• [refactor] PKey.read to use BC fully when reading public keys
• [fix] OpenSSL::X509::CRL#sign to accept string digest
• [fix] OpenSSL::X509::Request#version default is -1
• [fix] resolving EC key from X509::Request.new(pem)
• [feat] implement OpenSSL::X509::Request#signature_algorithm
• [fix] work-around CSR failing with EC key (#294)
• [feat] implement OpenSSL::PKey::EC#to_text (#280)
• [feat] partial support for PKey::EC::Point#to_octet_string(form)
• [feat] implement OpenSSL::PKCS7::SignerInfo#signed_time (#269)
• [feat] implement #oid method for PKey classes (#281)
• [fix] raise PKeyError from PKey.read when no key (#285)
• [fix] restore PKCS#8 EC key handling (see #292)
• [fix] revert readPrivateKey so public key is not lost (#292)