= Improvements

* The relative_path plugin is now faster if you are calling
  relative_path or relative_prefix more than once when handling a
  request.

* The typecast_params.convert! method in the typecast_params plugin
  now handles explicit nil values the same as missing values.
  Explicit nil values do not generally occur in normal Rack parameter
  parsing, but they can occur when using the json_parser plugin to
  parse JSON requests.

* Roda now avoids method redefinition warnings in verbose mode by
  using a self alias.  As Ruby 3 is dropping uninitialized instance
  variable warnings, Roda will be verbose warning free if you are
  using Ruby 3.
