.rubocop.yml in key_tree-0.7.0 vs .rubocop.yml in key_tree-0.8.0

@@ -1,10 +1,23 @@
+%YAML 1.1
+---
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.6
+  NewCops: enable
 
 Metrics/BlockLength:
   Exclude:
     - 'spec/*_spec.rb'
 
 Style/BlockDelimiters:
   Exclude:
     - 'spec/*_spec.rb'
+
+Style/HashEachMethods:
+  Enabled: true
+
+Style/HashTransformKeys:
+  Enabled: true
+
+Style/HashTransformValues:
+  Enabled: true
+...