Bump appraisal from 2.2.0 to 2.3.0

[dependabot-preview]

Bumps appraisal from 2.2.0 to 2.3.0.

Release notes

Sourced from appraisal's releases.

2.3.0

• Auto-install the right bundler version (#168),
• Test against Ruby 2.4, 2.5, 2.6, 2.7 (#166),
• Allow specifying the path option to bundler (#165),
• Fix acceptance tests under JRuby (#167),
• Make git_source work in nested groups (#160),
• Drop MRI 1.8.7-2.2 support (#158),
• Document all commands in README (#142),
• Allow passing through of the full-index option. (#137),
• Avoid line continuations without parentheses (#138),
• Added RBX to the build matrix (#117),
• Remove suggestion of RubyGems in Rakefiles (#128),
• Update README.md to add appraisal in gemspec instead of Gemfile (#122).

Commits

• af0ab55 Bump version to 2.3.0
• 5868643 Auto-install the right bundler version (#168)
• ac8341f Test against Ruby 2.4, 2.5, 2.6, 2.7 (#166)
• 659b6b7 Allow specifying the path option to bundler (#165)
• ef6cd6a Fix acceptance tests under jruby (#167)
• a904a4a Make git_source work in nested groups (#160)
• 92d5134 Drop MRI 1.8.7-2.2 support (#158)
• c4af859 Docs: List all commands in readme (#142)
• 5d1edf6 Allow passing through of the full-index option. (#137)
• 8382afa Avoid line continuations without parentheses. (#138)
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 96.818% when pulling fb1d901 on dependabot/bundler/appraisal-2.3.0 into f90c900 on master.

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