Update pry requirement from ~> 0.14.2 to ~> 0.15.0

Updates the requirements on [pry](https://github.com/pry/pry) to permit the latest version.
- [Release notes](https://github.com/pry/pry/releases)
- [Changelog](https://github.com/pry/pry/blob/master/CHANGELOG.md)
- [Commits](pry/pry@v0.14.2...v0.15.0)

---
updated-dependencies:
- dependency-name: pry
  dependency-type: direct:development
...

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

ra10ke.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'semverse', '>= 2.0', '< 4'
   spec.add_dependency 'solve', '~> 4.0', '>= 4.0.4'
   spec.add_dependency 'table_print', '~> 1.5.6'
-  spec.add_development_dependency 'pry', '~> 0.14.2'
+  spec.add_development_dependency 'pry', '~> 0.15.0'
   spec.add_development_dependency 'rspec', '~> 3.6'
   spec.add_development_dependency 'simplecov', '~> 0.22.0'
   spec.add_development_dependency 'voxpupuli-rubocop', '~> 3.0.0'