.rubocop.yml in telephone_appointments-0.2.1 vs .rubocop.yml in telephone_appointments-0.3.0

@@ -1,10 +1,10 @@
 AllCops:
   Exclude:
     - 'bin/*'
     - 'db/**/*'
     - 'vendor/**/*'
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.4
 
 Documentation:
   Enabled: false
 
 Lint/HandleExceptions: