Update ruby-rspec-expectations to 3.9.0.
pkgsr change: Add "USE_LANGUAGES= # none".
### 3.9.0 / 2019-10-02
[Full Changelog](http://github.com/rspec/rspec-expectations/compare/v3.8.5...v3.9.0)
Enhancements:
* The `respond_to` matcher now uses the signature from `initialize` to validate checks
for `new` (unless `new` is non standard). (Jon Rowe, #1072)
* Generated descriptions for matchers now use `is expected to` rather than `should` in
line with our preferred DSL. (Pete Johns, #1080, rspec/rspec-core#2572)
* Add the ability to re-raise expectation errors when matching
with `match_when_negated` blocks. (Jon Rowe, #1130)
* Add a warning when an empty diff is produce due to identical inspect output.
(Benoit Tigeot, #1126)
### 3.8.6 / 2019-10-07
Bug Fixes:
* Revert #1125 due to the change being incompatible with our semantic versioning
policy.
### 3.8.5 / 2019-10-02
[Full Changelog](http://github.com/rspec/rspec-expectations/compare/v3.8.4...v3.8.5)
Bug Fixes:
* Prevent unsupported implicit block expectation syntax from being used.
(Phil Pirozhkov, #1125)
### 3.8.4 / 2019-06-10
[Full Changelog](http://github.com/rspec/rspec-expectations/compare/v3.8.3...v3.8.4)
Bug Fixes:
* Prevent false negatives when checking objects for the methods required to run the
the `be_an_instance_of` and `be_kind_of` matchers. (Nazar Matus, #1112)
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