.rubocop.yml in differential-1.0.6 vs .rubocop.yml in differential-1.1.0

@@ -1,5 +1,8 @@
 Metrics/LineLength:
   Max: 100
 
 Metrics/BlockLength:
   ExcludedMethods: ['it', 'describe', 'context']
+
+AllCops:
+  TargetRubyVersion: 2.3