Added summary for `mrbgems/mruby-errno`
MODIFY
mrbgems/mruby-errno/mrbgem.rake
mrbgems/mruby-errno/mrbgem.rake
MRuby::Gem::Specification.new('mruby-errno') do |spec|
spec.license = 'MIT'
spec.authors = 'Internet Initiative Japan Inc.'
+ spec.summary = 'Errno module and SystemCallError class'
end

Added summary for `mrbgems/mruby-errno`