.rubocop.yml in mailerlite-1.13.1 vs .rubocop.yml in mailerlite-1.14.0

- old
+ new

@@ -1,6 +1,6 @@
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.6
   NewCops: enable
 
 Layout/ParameterAlignment:
   Enabled: true
   EnforcedStyle: with_fixed_indentation