0.13.0

Added

• Support for relative backreferences using \k<-1> (-1 references the
  previous group) (#121)
• Add try_replacen to Regex which returns a Result instead of panicking
  when matching errors (#130)

Changed

• Switch from regex crate to regex-automata and regex-syntax (lower level APIs)
  to simplify internals (#121)
• Note: Due to above change, more backtracking is done in fancy-regex itself
  instead of regex-automata, and you might get a BacktrackLimitExceeded with
  some patterns that you didn't get before. You can increase the backtrack limit
  using RegexBuilder::backtrack_limit to help with that.
• Allow escaping some letters in character classes, e.g. [\A] used to error
  but now matches the same as [A] (for compatibility with Oniguruma)
• MSRV (minimum supported Rust version) is now 1.66.1 (from 1.61.0)

Fixed

• Fix index out of bounds panic when parsing unclosed (?( (#125)