Update minitest-reporters requirement from ~> 1.6.0 to ~> 1.7.1

Updates the requirements on [minitest-reporters](https://github.com/CapnKernul/minitest-reporters) to permit the latest version.
- [Changelog](https://github.com/minitest-reporters/minitest-reporters/blob/master/CHANGELOG.md)
- [Commits](minitest-reporters/minitest-reporters@v1.6.0...v1.7.1)

---
updated-dependencies:
- dependency-name: minitest-reporters
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile

@@ -7,6 +7,6 @@ gemspec
 
 gem 'appraisal'
 gem 'minitest', '~> 5.0'
-gem 'minitest-reporters', '~> 1.6.0'
+gem 'minitest-reporters', '~> 1.7.1'
 gem 'rake', '~> 13.2'
 gem 'rubocop', '~> 1.25.1'