Update supported ruby versions

ruby-docx / docx

a ruby library/gem for interacting with .docx files

MIT License

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Closed satoryu closed 4 years ago

satoryu commented 4 years ago

ruby 2.7.0 has been released last week 🎉
This project has not specified supported ruby versions.

This PR provides changes on .travis.yml and the gemspec file to specify this gem supports 2.4.x or newer and drops 2.3(its EOR has come).