.rubocop.yml in mrkt-1.2.1 vs .rubocop.yml in mrkt-1.2.2

@@ -1,10 +1,10 @@
 require:
   - rubocop-rake
   - rubocop-rspec
 
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.6
   Exclude:
     - 'bin/**/*'
     - 'vendor/**/*'
   NewCops: enable