gemspec: Drop EOL'd property rubyforge_project

josedonizetti / ruby-duration

Immutable type that represents some amount of time with accuracy in seconds.

http://bit.ly/ruby-duration

MIT License

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Closed olleolleolle closed 3 years ago

olleolleolle commented 5 years ago

The RubyGems gemspec property rubyforge_project has been removed without a replacement. This PR removes that property.