Log Message:
www/ruby-net-http-persistent: update to 4.0.0

Update ruby-net-http-persistent to 4.0.0.

=== 4.0.0 / 2020-04-30

Breaking changes:

* Removed built-in support for retrying failed requests as Net::HTTP has this
  built-in for all supported versions.  Pull request #100 by Michael Grosser.
* Dropped support for EoL ruby versions (< 2.4).  Future feature releases may
  drop support for ruby versions that are at end-of-life or in security-only
  maintenance mode with any release.  Pull request #113 by David Rodríguez

New features:

* Added Net::HTTP::Persistent#max_retries= to configure the number of retries
  performed on a request for ruby versions that support it (2.5+).
* URI-ness is determined through #respond_to? to allow compatibility with
  Addressable::URI.  Pull request #67 by Ryan McKern.
* Use require_relative to reduce patch burden for vendored versions.  Pull
  Request #106 by David Rodríguez

Bug fixes:

* Stop wasting a connection when the keep-alive timeout is less than the idle
  timeout.  Pull request #115 by Yap Sok Ann.
* Improved use of URI#hostname for IPv6 connections.  Pull request #76 by
  Tomas Koutsky.
* Improved check for Process::RLIMIT_NOFILE support.  Pull request #109 by Vít
  Ondruch.
* Fix namespace in comments for escape/unescape wrappers.  Pull request #114
  by David Rodríguez.
* Fix History.txt timestamp for 3.0.0 release.  Pull request #107 by Joe Van
  Dyk.
* Fix link to PR #98 in 3.1.0 release notes.  Pull request #110 by Justin
  Reid.

Other:

* Updated Net::HTTP::Persistent#reconnect documentation to indicate that all
  connections are reset.  Issue #117 by Taisuke Miyazaki.