Release 2.1.0

[eitoball]

Summary

• release net-ping 2.1.0
• synchronize the gemspec, Net::Ping::VERSION, and its test
• document platform-specific gem metadata (Add platform-specific gem dependencies #44) and the FreeBSD ping6 timeout fix (Fix FreeBSD ping6 timeout option #43)

Validation

• bundle exec rake test
• bundle exec rake gem:create gem:check

[Copilot]

Pull request overview

This PR prepares the net-ping 2.1.0 release by aligning the gem version across the gemspec, library constant, and its corresponding test, and by publishing a finalized changelog entry for 2.1.0 that documents the previously implemented platform-specific gem metadata work (#44) and FreeBSD ping6 timeout fix (#43).

Changes:

• Bump gem version to 2.1.0 in net-ping.gemspec.
• Bump Net::Ping::VERSION to 2.1.0 and update its unit test accordingly.
• Replace the CHANGES “Next Release” placeholder with the 2.1.0 dated release entry and links to PRs #44 and #43.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/test_net_ping.rb	Updates the version assertion to match the 2.1.0 release.
net-ping.gemspec	Updates gemspec version to 2.1.0 for packaging/release.
lib/net/ping/ping.rb	Updates Net::Ping::VERSION constant to 2.1.0.
CHANGES	Adds the 2.1.0 release heading and notes referencing #44 and #43.

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