gem: bump minimum required Ruby version to Ruby 2.5

.rubocop.yml

@@ -1,5 +1,6 @@
 AllCops:
-  TargetRubyVersion: '2.3'
+  TargetRubyVersion: '2.5'
+  NewCops: enable
 
 Layout/EmptyLineAfterGuardClause:
   Enabled: false

.travis.yml

@@ -5,8 +5,6 @@ rvm:
 - 2.7
 - 2.6
 - 2.5
-- 2.4
-- 2.3
 
 script:
 - bundle exec rake travis

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 3.0.0
+
+IMPROVEMENTS:
+
+- Drop EOL Ruby 2.4 and lower support, now minimum version supported is Ruby 2.5
+
 ## 2.3.1 (July 27, 2020)
 
 IMPROVEMENTS:

dyndnsd.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |s|
   s.executables = ['dyndnsd']
   s.extra_rdoc_files = Dir['README.md', 'CHANGELOG.md', 'LICENSE']
 
-  s.required_ruby_version = '>= 2.3'
+  s.required_ruby_version = '>= 2.5'
 
   s.add_runtime_dependency 'async-dns', '~> 1.2.0'
   s.add_runtime_dependency 'jaeger-client', '~> 0.10.0'
@@ -39,6 +39,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
-  s.add_development_dependency 'rubocop', '~> 0.81.0'
+  s.add_development_dependency 'rubocop', '~> 0.82.0'
   s.add_development_dependency 'solargraph'
 end

lib/dyndnsd/textfile_reporter.rb

@@ -28,7 +28,6 @@ module Dyndnsd
           sleep @interval
 
           Thread.new do
-            begin
             write
           rescue StandardError => e
             @on_error[e] rescue nil
@@ -36,7 +35,6 @@ module Dyndnsd
         end
       end
     end
-    end
 
     # @return [void]
     def stop