Update simplecov-rcov requirement from ~> 0.2.3 to ~> 0.3.0 (#86)

Updates the requirements on [simplecov-rcov](https://github.com/fguillen/simplecov-rcov) to permit the latest version.
- [Release notes](https://github.com/fguillen/simplecov-rcov/releases)
- [Commits](fguillen/simplecov-rcov@v0.2.3...v0.3.0)

---
updated-dependencies:
- dependency-name: simplecov-rcov
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

cf-uaa-lib.gemspec

@@ -39,7 +39,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake', '>= 10.3.2', '~> 13.0'
   s.add_development_dependency 'rspec', '>= 2.14.1', '~> 3.9'
   s.add_development_dependency 'simplecov', '~> 0.21.2'
-  s.add_development_dependency 'simplecov-rcov', '~> 0.2.3'
+  s.add_development_dependency 'simplecov-rcov', '~> 0.3.0'
   s.add_development_dependency 'ci_reporter', '>= 1.9.2', '~> 2.0'
   s.add_development_dependency 'json_pure', '>= 1.8.1', '~> 2.5'
   s.add_development_dependency 'ci_reporter_rspec', '~> 1.0'