Log Message:
devel/ruby-rspec-core: update to 3.9.0

Update ruby-rspec-core to 3.9.0.

pkgsr change: Add "USE_LANGUAGES=	# none".

### 3.9.0 / 2019-10-07
[Full Changelog](http://github.com/rspec/rspec-core/compare/v3.8.2...v3.9.0)

Enhancements:
* Improve the handling of errors during loading support files, if a file
  errors before loading specs, RSpec will now skip loading the specs.
  (David Rodríguez, #2568)
* Add support for --example-matches to run examples by regular expression.
  (Sam Joseph, Matt Rider, @okothkongo1, #2586)
* Add `did_you_mean` suggestions for file names encountering a `LoadError`
  outside of examples. (@obromios, #2601)
* Add a minimalist quick fix style formatter, only outputs failures as
  `file:line:message`. (Romain Tartière, #2614)
* Convert string number values to integer when used for \ 
`RSpec::Configuration#fail_fast`
  (Viktor Fonic, #2634)
* Issue warning when invalid values are used for `RSpec::Configuration#fail_fast`
  (Viktor Fonic, #2634)
* Add support for running the Rake task in a clean environment.
  (Jon Rowe, #2632)
* Indent messages by there example group / example in the documentation formatter.
  (Samuel Williams, #2649)

### 3.8.2 / 2019-06-29
[Full Changelog](http://github.com/rspec/rspec-core/compare/v3.8.1...v3.8.2)

Bug Fixes:

* Fix `config.define_derived_metadata` so that cascades are not triggered
  until metadata has been assigned to the example or example group
  (Myron Marston, #2635).

### 3.8.1 / 2019-06-13
[Full Changelog](http://github.com/rspec/rspec-core/compare/v3.8.0...v3.8.1)

Bug Fixes:

* Handle RSpec description(s) with japanese chars in CP932 encoded files.
  (Benoit Tigeot, #2575)
* When defining `let` methods that overwrite an existing method, prevent
  a warning being issued by removing the old definition. (Jon Rowe, #2593)
* Prevent warning on Ruby 2.6.0-rc1 (Keiji Yoshimi, #2582)
* Fix `config.define_derived_metadata` so that it supports cascades.
  (Myron Marston, #2630).