.rubocop.yml in socrates-0.1.20 vs .rubocop.yml in socrates-0.1.21

- old
+ new

@@ -1,8 +1,5 @@
 inherit_from:
   - https://raw.githubusercontent.com/carbonfive/c5-conventions/master/rubocop/rubocop.yml
 
-AllCops:
-  TargetRubyVersion: 2.4
-
 Naming/UncommunicativeMethodParamName:
   Enabled: false