Update gemspec for release

denko_piboard.gemspec

@@ -4,15 +4,17 @@ Gem::Specification.new do |s|
   s.name        = 'denko-piboard'
   s.version     = Denko::PiBoard::VERSION
   s.licenses    = ['MIT']
-  s.summary     = "Use Linux GPIO, I2C, SPI and PWM as a Denko::PiBoard"
-  s.description = "Use Linux GPIO, I2C, SPI and PWM as a Denko::PiBoard"
+  s.summary     = "Linux SBC GPIO in Ruby"
+  s.description = "Use Linux single-board-computer GPIO, I2C, SPI and PWM in Ruby"
 
   s.authors     = ["vickash"]
   s.email       = '[email protected]'
   s.files       =  Dir['**/*'].reject { |f| f.match /.gem\z/}
   s.homepage    = 'https://github.com/denko-rb/denko-piboard'
   s.metadata    = { "source_code_uri" => "https://github.com/denko-rb/denko-piboard" }
 
+  s.required_ruby_version = '>=3'
+
   s.add_dependency 'lgpio',  '~> 0.1'
   s.add_dependency 'denko',  '~> 0.14'
 end