Drop Ruby 3.0 support

Author: mklocek

.github/workflows/main.yml

@@ -9,11 +9,10 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '3.0.7'
           - '3.1.6'
-          - '3.2.4'
-          - '3.3.3'
-
+          - '3.2.7'
+          - '3.3.7'
+          - '3.4.2'
     steps:
       - uses: actions/checkout@v4
       - name: Set up Ruby

.rubocop.yml

@@ -7,7 +7,7 @@ inherit_mode:
     - Exclude
 
 AllCops:
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 3.1
   NewCops: enable
   Exclude:
     - "gemfiles/**/*"

mailtrap.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = 'Official mailtrap.io API client'
   spec.homepage = 'https://github.com/railsware/mailtrap-ruby'
   spec.license = 'MIT'
-  spec.required_ruby_version = '>= 3.0.0'
+  spec.required_ruby_version = '>= 3.1.0'
 
   spec.metadata['homepage_uri'] = spec.homepage
   spec.metadata['source_code_uri'] = 'https://github.com/railsware/mailtrap-ruby'