Adjust TravisCI Ruby matrix#2371

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wasifhossain wants to merge 4 commits into0-10-stablefrom

Commits on Jan 10, 2020

Update travis to support Ruby 2.7 along with existing versions
wasifhossain
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Commits on Feb 18, 2020

Use simplecov < 0.18.x to support ruby < 2.4
wasifhossain
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Commits on Feb 19, 2020

Restrict rack to <= 2.0.8 as long as grape >= 1.3.0 is not supported
wasifhossain
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Uninstall bundler >= 2 if it already exists on travis
wasifhossain
committed