Update simplecov-lcov requirement from < 0.8 to < 0.9 (#66)

Updates the requirements on [simplecov-lcov](https://github.com/fortissimo1997/simplecov-lcov) to permit the latest version.
- [Release notes](https://github.com/fortissimo1997/simplecov-lcov/releases)
- [Commits](fortissimo1997/simplecov-lcov@v0.1.0...v0.8.0)

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

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

Author: dependabot[bot]

Gemfile

@@ -9,4 +9,4 @@ gem 'minitest', '~> 5.0'
 gem 'rake', '~> 13.0'
 gem 'rubocop', '~> 1.17.0'
 gem 'simplecov', '~> 0.21.2', require: false # CodeClimate not compatible with 0.18+ yet - https://github.com/codeclimate/test-reporter/issues/413
-gem 'simplecov-lcov', '< 0.8'
+gem 'simplecov-lcov', '< 0.9'