Switch to New Setter-based RSA PKey API

[waynerobinson]

The accessors on setting PKey elements inOpenSSL::PKey::RSA have been deprecated in Ruby 2.4+.

Move to newer method-based setters.

[coveralls]

Coverage decreased (-4.8%) to 88.507% when pulling 87e3546 on AllMyFunds:update_deprecrated_pkey_interface into 8b8fa70 on potatosalad:master.

[waynerobinson]

The Travis tests seem to run with the rather ancient version of Ruby of 2.3.1p112, hence the failures. Not sure why the coverage was decreased given the existing test cases cover the same methods.

By the way, as of Ruby 2.5, the JOSE library doesn't work at all as these accessors have been deprecated entirely.

[potatosalad]

@waynerobinson Thanks for submitting this! I'll take a look into this sometime this week.

[Firefishy]

@potatosalad @waynerobinson Any progress getting this fix merged?

[Firefishy]

Build with Ruby 2.5 seems ok: https://travis-ci.org/potatosalad/ruby-jose/builds/404606921

[Firefishy]

JOSE v1.1.2 release also broken on ruby >=2.4.4

[rodxavier]

Can this be merged and released @potatosalad?

[potatosalad]

@Firefishy @rodxavier Released as part of jose 1.1.3

@waynerobinson Thanks for your contribution!

[rodxavier]

Thanks so much @potatosalad.