Build test for support all ruby

[yukihirop]

Summary

Resolve #123

Work

all_support_ruby bundle

/bin/bash devscript/all_support_ruby.sh bundle
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===== Bundle install for All Support Ruby Result =====
ruby-2.3.3: 0
ruby-2.4.2: 0
ruby-2.5.8: 0
ruby-2.6.6: 0
ruby-2.7.1: 0
======================================================

case when specify ruby version 2.6.6 and 2.7.1

/bin/bash devscript/all_support_ruby.sh bundle
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===== Bundle install for All Support Ruby Result =====
ruby-2.6.6: 0
ruby-2.7.1: 0
======================================================

all_support_ruby rspec

/bin/bash devscript/all_support_ruby.sh rspec
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===== Rspec for All Support Ruby Result =====
ruby-2.3.3: 0
ruby-2.4.2: 0
ruby-2.5.8: 0
ruby-2.6.6: 0
ruby-2.7.1: 0
=============================================

case when specify ruby version 2.6.6 and 2.7.1

/bin/bash devscript/all_support_ruby.sh rspec 2.6.6 2.7.1
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===== Rspec for All Support Ruby Result =====
ruby-2.6.6: 0
ruby-2.7.1: 0
=============================================

all_support_ruby list

$ /bin/bash devscript/all_support_ruby.sh list
===== Display All Support Ruby Version =====
2.3.3
2.4.2
2.5.8
2.6.6
2.7.1
============================================

[yukihirop]

LGTM

travis is success

https://travis-ci.org/github/yukihirop/r2-oas/builds/692643979