Log Message:
ruby-public_suffix: update to 4.0.1.

pkgsrc changes:
- take maintainership

Upstream changes:

#### Release 4.0.1

- CHANGED: Updated definitions.

#### Release 4.0.0

- CHANGED: Minimum Ruby version is 2.3

#### Release 3.1.1

- CHANGED: Updated definitions.
- CHANGED: Rolled back support for Ruby 2.3 (GH-161, GH-162)

IMPORTANT: 3.x is the latest version compatible with Ruby 2.1 and Ruby 2.2.

#### Release 3.1.0

- CHANGED: Updated definitions.
- CHANGED: Minimum Ruby version is 2.3
- CHANGED: Upgraded to Bundler 2.x