Ruby 2.4 or higher is required

.rubocop.yml

@@ -6,8 +6,9 @@ Rails:
   Enabled: true
 
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.4
   TargetRailsVersion: 5.2
+  NewCops: enable
 
 Metrics:
   Enabled: false
@@ -45,17 +46,8 @@ Style/Documentation:
 Style/ExpandPathArguments:
   Enabled: false
 
-Style/HashEachMethods:
-  Enabled: true
-
 Style/HashTransformKeys:
   Enabled: false
 
 Style/HashTransformValues:
   Enabled: false
-
-Lint/RaiseException:
-  Enabled: true
-
-Lint/StructNewOverride:
-  Enabled: true

CHANGELOG.md

@@ -11,6 +11,7 @@ Changelog
 - Redundant status and priority in messages #56
 - Show attachments for new issues
 - Show indicator for private comment on issue
+- Ruby 2.4 or higher is required
 
 1.0.5
 -----

init.rb

@@ -1,4 +1,4 @@
-raise "\n\033[31mredmine_messenger requires ruby 2.3 or newer. Please update your ruby version.\033[0m" if RUBY_VERSION < '2.3'
+raise "\n\033[31mredmine_messenger requires ruby 2.4 or newer. Please update your ruby version.\033[0m" if RUBY_VERSION < '2.4'
 
 Redmine::Plugin.register :redmine_messenger do
   name 'Redmine Messenger'