Specifies the supported ruby version

Signed-off-by: M. Scott Ford <[email protected]>

Author: mscottford

cyclonedx-ruby.gemspec

@@ -11,6 +11,8 @@ Gem::Specification.new do |spec|
   spec.homepage    = 'https://github.com/CycloneDX/cyclonedx-ruby-gem'
   spec.license     = 'Apache-2.0'
 
+  spec.required_ruby_version = ">= 2.7.0"
+
   spec.files = Dir.chdir(__dir__) do
     `git ls-files -z`.split("\x0").reject do |f|
       (File.expand_path(f) == __FILE__) || f.start_with?(*%w[bin/ test/ spec/ features/ .git .circleci appveyor])