Log Message:
textproc/ruby-unicode-display_width: update to 2.0.0

2.0.0 (2020-12-30)

* Release 2.0.0
* Supports Ruby 3.0

2.0.0.pre2 (2020-03-11)

* Update 2.0 branch to Unicode 13

2.0.0.pre1 (2020-01-16)

Will be published as non-pre version on rubygems.org when Ruby 3.0 is
released (December 2020)

* Introduce new class-based API, which remembers your string-width
  configuration. See README for details.

* Remove auto-loading of string extension

  o You can: require "unicode/display_width/string_ext" to continue to use
    the string extension

  o The manual opt-out require "unicode/display_width/no_string_ext" is not
    needed anymore and will issue a warning in the future

* Remove (already deprecated) String#display_size and String#display_width
  aliases

Refactorings / Internal Changes:

* Freeze string literals
* The Unicode::DisplayWidth now is class, instead of a module, this enables
  the new config-object API