Release v0.18.0

* Changed: Layout/IndentationWidth cop enabled by default
* Changed: Use the new `Cop::Base` API instead of the deprecated `Cop::Cop`
* Removed: support for Ruby 2.6
* Removed: deprecated config files for RuboCop < 0.68

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rubocop-github (0.17.0)
+    rubocop-github (0.18.0)
       rubocop (>= 1.0.0)
       rubocop-performance
       rubocop-rails

rubocop-github.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |s|
   s.name = "rubocop-github"
-  s.version = "0.17.0"
+  s.version = "0.18.0"
   s.summary = "RuboCop GitHub"
   s.description = "Code style checking for GitHub Ruby repositories "
   s.homepage = "https://github.com/github/rubocop-github"