Update shoulda-context requirement from ~> 1.2 to ~> 2.0

[dependabot]

Updates the requirements on shoulda-context to permit the latest version.

Changelog

Sourced from shoulda-context's changelog.

2.0.0 (2020-06-13)

Backward-incompatible changes

• Drop support for RSpec 2 matchers. Matchers passed to should must conform to RSpec 3's API (failure_message and failure_message_when_negated).
• Drop support for older versions of Rails. Rails 4.x-6.x are the only versions supported now.
• Drop support for older versions of Ruby. Ruby 2.4.x-2.7.x are the only versions supported now.

Bug fixes

• Fix how test names are generated so that when including the name of the outermost test class, "Test" is not removed from the class name if it does not fall at the end.
• Remove warning from Ruby about context not being used when using the gem with warnings enabled.
• Fix macro autoloading code. Files intended to hold custom macros which are located in either test/shoulda_macros, vendor/gems/*/shoulda_macros, or vendor/plugins/*/shoulda_macros are now loaded and mixed into your test framework's automatically.
• Restore compatibility with Shoulda Matchers, starting from 3.0.
• Fix some compatibility issues with Minitest 5.
• Fix running tests within a Rails < 5.2 environment so that when tests fail, an error is not produced claiming that Minitest::Result cannot find a test method.

Commits

• eff9fdd Bump version to 2.0.0 🎉
• 5389069 Bump version to 2.0.0.rc4
• 531e07b Drop support for Ruby 2.3
• d0afbfd Fill in the remaining Rails dependencies
• 6858b4a Bump version to 2.0.0.rc3
• a8dcab4 Update dependencies
• 8c890f5 Update maintainers
• ce103c8 Update copyright year
• b8937aa Remove 'assigned but unused variable' warning
• 2aa0180 Emit warnings generated during test runs
• Additional commits viewable in compare view

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