Use ruby 3.0.0-preview2 until 3.0.0-rc1 is listed as supported on https://rubies.travis-ci.org/, don't use BUILD_DOCKER
Use ruby 3.0.0-preview2 until 3.0.0-rc1 is listed as supported on https://rubies.travis-ci.org/, don't use BUILD_DOCKER

Paxa/fast_excel,Paxa/fast_excel,Paxa/fast_excel