Remove support for Ruby 3.0 (because EOL)

Author: ledermann

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.0', '3.1', '3.2', '3.3']
+        ruby: ['3.1', '3.2', '3.3']
         rails: ['6.1', '7.0', '7.1', '7.2', '8.0']
         exclude:
           - ruby: 3.1

README.md

@@ -19,7 +19,7 @@ This Ruby gem provides a double entry accounting system for use in any Rails app
 
 ## Dependencies
 
-* Ruby 3.0+
+* Ruby 3.1+
 * Rails 6.1+ (including Rails 8.0)
 
 ## Installation

keepr.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |spec|
   spec.summary       = 'Some basic ActiveRecord models to build a double entry bookkeeping application'
   spec.homepage      = 'https://github.com/ledermann/keepr'
   spec.license       = 'MIT'
-  spec.required_ruby_version = '>= 3.0'
+  spec.required_ruby_version = '>= 3.1'
 
   spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }