Update rubbocop

.rubocop.yml

@@ -1,10 +1,19 @@
 inherit_from:
   - .rubocop_todo.yml
   - .rubocop/layout.yml
+  - .rubocop/metrics.yml
   - .rubocop/style.yml
 
+require:
+  - rubocop-performance
+  - rubocop-rake
+  - rubocop-rspec
+
 AllCops:
+  NewCops: enable
   DefaultFormatter: fuubar
   DisplayCopNames: true
-  NewCops: enable
+  DisplayStyleGuide: true
+  ExtraDetails: true
+  SuggestExtensions: true
   TargetRubyVersion: 2.6

.rubocop/metrics.yml

@@ -0,0 +1,17 @@
+Metrics/BlockLength:
+  Enabled: true
+  Exclude:
+    - "spec/**/*_spec.rb"
+    - "**/*.gemspec"
+
+Metrics/ClassLength:
+  Enabled: true
+  CountAsOne: [array, hash, heredoc, method_call]
+
+Metrics/MethodLength:
+  Enabled: true
+  CountAsOne: [array, hash, heredoc, method_call]
+
+Metrics/ModuleLength:
+  Enabled: true
+  CountAsOne: [array, hash, heredoc, method_call]