.rubocop.yml in socrates-0.1.25 vs .rubocop.yml in socrates-0.1.26

@@ -1,8 +1,15 @@
+require:
+  - rubocop-performance
+
 inherit_from:
-  - https://raw.githubusercontent.com/carbonfive/c5-conventions/master/rubocop/rubocop.yml
+  - https://raw.githubusercontent.com/carbonfive/c5-conventions/main/rubocop/.rubocop-common.yml
+  - https://raw.githubusercontent.com/carbonfive/c5-conventions/main/rubocop/.rubocop-performance.yml
 
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5 # this must match gemspec required_ruby_version
 
-Naming/MethodParameterName:
+Naming/VariableNumber:
+  Enabled: false
+
+Style/AccessorGrouping:
   Enabled: false