enable frozen_string_literal for Ruby 2.3+
commit879bccec2058505f3d5c446595083649169b357c
authorEric Wong <e@80x24.org>
Tue, 2 Feb 2016 20:11:22 +0000 (2 20:11 +0000)
committerEric Wong <e@80x24.org>
Tue, 2 Feb 2016 20:11:22 +0000 (2 20:11 +0000)
treeb498365b6a583b98d999032c164a588dd20f883d
parenta95c89375c43557ebed870b04f499ea66a06b1f2
enable frozen_string_literal for Ruby 2.3+

No changes for older Rubies, but this reduces garbage under 2.3
bin/posix-mq-rb
lib/posix_mq.rb
test/test_posix_mq.rb