Merge pull request #41 from hidakatsuya/support-ruby3.4

Drop support for Ruby 3.0

Author: hidakatsuya

rexer.gemspec

@@ -10,7 +10,7 @@ Gem::Specification.new do |spec|
   spec.description = "Rexer is a command-line tool for managing Redmine Extension (Plugin and Themes). It allows you to define extensions in a Ruby DSL and install, uninstall, update, and switch between different sets of the extensions."
   spec.homepage = "https://github.com/hidakatsuya/rexer"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 3.0.0"
+  spec.required_ruby_version = ">= 3.1.0"
 
   spec.metadata["source_code_uri"] = spec.homepage