v4.25.11

• release: "Mon, 22 Feb 2021 21:15:22 +0900 (JST)"
• version: "4.25.11"
• changes:
  • Fix typo in Sisimai::RFC3464
  • Import some commits from Sisimai version 5 preview #
    • Improved code for getting an email address in Sisimai::Address
    • Improved code for checking the day of month value, for converting a full month name and a full day of the week at Sisimai::DateTime
    • Improvement code for picking text blocks of message/rfc822 part in RFC5322
    • Add 60+ error message patterns
    • Improved code for encodings in Sisimai::Lhost::Domino, Sisimai::String