Drop Ruby 1.9.3 and JRuby 1.7 support

[pitr-ch]

• communicate with authors of depending gems
• think out and describe here how it will be dropped

[nijikon]

Can we also drop 2.0, 2.1 and 2.2 support?

[jeremyevans]

Related to this, concurrent-ruby 1.1.1 is already broken on ruby 1.9.3 because it uses LoadError#path, which wasn't added until 2.0.0 (

concurrent-ruby/lib/concurrent/utility/native_extension_loader.rb

Line 57 in 66d8d91

if e.path == path

).

This broke Sequel's tests on ruby 1.9.3: https://travis-ci.org/jeremyevans/sequel/jobs/451114760

You may want to consider pushing out 1.1.2 quickly, and either bumping required ruby version to 2.0.0 or reverting the LoadError#path usage or making it conditional.

[pitr-ch]

@jeremyevans thanks for letting me know. However I've fixed that problem, I run into it as well. Maybe just part of concurrent-ruby is required which then misses the utility/1.9.3 file. I'll release 1.1.2 which will be more defensive today, see #773. You can then remove the restriction

[pitr-ch]

@jeremyevans 1.1.2 is pushed, please let me know if it works for you.

[jeremyevans]

@pitr-ch Yep, looks good here, thank you for the quick fix: https://travis-ci.org/jeremyevans/sequel/jobs/451424245

[chrisseaton]

Nobody serious is using 1.9 at the moment. We only support JRuby latest at the moment. We'll re-evaluate support Ruby versions in the future.

[jeremyevans]

@chrisseaton If you are going to close this, can you please update the gemspec: https://github.com/ruby-concurrency/concurrent-ruby/blob/master/concurrent-ruby.gemspec#L30