Update rubocop-rails requirement from ~> 2.25.0 to ~> 2.26.0

Updates the requirements on [rubocop-rails](https://github.com/rubocop/rubocop-rails) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.25.0...v2.26.0)

---
updated-dependencies:
- dependency-name: rubocop-rails
  dependency-type: direct:development
...

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

meta-tags.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec-html-matchers", "~> 0.10.0"
   spec.add_development_dependency "simplecov", "~> 0.22.0"
   # Code style
-  spec.add_development_dependency "rubocop-rails", "~> 2.25.0"
+  spec.add_development_dependency "rubocop-rails", "~> 2.26.0"
   spec.add_development_dependency "rubocop-rake", "~> 0.6.0"
   spec.add_development_dependency "rubocop-rspec", "~> 3.0.1"
   spec.add_development_dependency "standard", "~> 1.31"