Log Message:
devel/ruby-rspec-rails: update to 3.7.2

### 3.7.2 / 2017-11-20
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.7.1...v3.7.2)

Bug Fixes:

* Delay loading system test integration until used. (Jon Rowe, #1903)
* Ensure specs using the aggregate failures feature take screenshots on failure.
  (Matt Brictson, #1907)

### 3.7.1 / 2017-10-18
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.7.0...v3.7.1)

Bug Fixes:

* Prevent system test integration loading when puma or capybara are missing (Sam \ 
Phippen, #1884)

### 3.7.0 / 2017-10-17
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.6.0...v3.7.0)

Bug Fixes:

* Prevent "template not rendered" log message from erroring in threaded
  environments. (Samuel Cochran, #1831)
* Correctly generate job name in error message. (Wojciech Wnętrzak, #1814)

Enhancements:

* Allow `be_a_new(...).with(...)` matcher to accept matchers for
  attribute values. (Britni Alexander, #1811)
* Only configure RSpec Mocks if it is fully loaded. (James Adam, #1856)
* Integrate with `ActionDispatch::SystemTestCase`. (Sam Phippen, #1813)