Update ruby-grape-danger requirement from ~> 0.1.1 to ~> 0.2.0 (#824)

Updates the requirements on [ruby-grape-danger](https://github.com/ruby-grape/danger) to permit the latest version.
- [Release notes](https://github.com/ruby-grape/danger/releases)
- [Changelog](https://github.com/ruby-grape/danger/blob/master/CHANGELOG.md)
- [Commits](ruby-grape/danger@v0.1.1...v0.2.0)

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

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

Author: dependabot[bot]

Gemfile

@@ -33,7 +33,7 @@ end
 group :test do
   gem 'coveralls_reborn', require: false
 
-  gem 'ruby-grape-danger', '~> 0.1.1', require: false
+  gem 'ruby-grape-danger', '~> 0.2.0', require: false
   gem 'simplecov', require: false
 
   unless ENV['MODEL_PARSER'] == 'grape-swagger-entity'