.rubocop.yml in simple-httpd-0.3.5 vs .rubocop.yml in simple-httpd-0.4.0

@@ -1,6 +1,6 @@
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.5
   Exclude:
     - 'spec/**/*'
     - 'test/**/*'
     - 'bin/**/*'
     - 'tasks/release.rake'