.rubocop.yml in dingtalk-robot-0.1.0 vs .rubocop.yml in dingtalk-robot-0.2.0

@@ -1,6 +1,6 @@
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.3
 Metrics/LineLength:
   Max: 120
 Metrics/MethodLength:
   Max: 30 # default * 3
 Metrics/AbcSize: