Version 3.1.1

Fix for macOS and minor improvements.

The gem is available at https://rubygems.org/gems/cld3/versions/3.1.1.
The documentation is available at http://www.rubydoc.info/gems/cld3/3.1.1.

Version 3.1.0

Apply minor changes.
The gem is available at https://rubygems.org/gems/cld3/versions/3.1.0.
The documentation is available at http://www.rubydoc.info/gems/cld3/3.1.0.

Version 3.0.0

Initial release.