Log Message:
devel/ruby-concurrent-ruby: update to 1.1.4

## Current

## Release v1.1.4 (14 Dec 2018)

* (#780) Remove java_alias of 'submit' method of Runnable to let executor \ 
service work on java 11
* (#776) Fix NameError on defining a struct with a name which is already taken \ 
in an ancestor

## Release v1.1.3 (7 Nov 2018)

* (#775) fix partial require of the gem (although not officially supported)

## Release v1.1.2 (6 Nov 2018)

* (#773) more defensive 1.9.3 support

## Release v1.1.1, edge v0.4.1 (1 Nov 2018)

* (#768) add support for 1.9.3 back

## Release v1.1.0, edge v0.4.0 (31 OCt 2018) (yanked)

* (#768) yanked because of issues with removed 1.9.3 support

## Release v1.1.0.pre2, edge v0.4.0.pre2 (18 Sep 2018)

concurrent-ruby:

* fixed documentation and README links
* fix Set for TruffleRuby and Rubinius
* use properly supported TruffleRuby APIs

## Release v1.1.0.pre1, edge v0.4.0.pre1 (15 Aug 2018)

concurrent-ruby:

* requires at least Ruby 2.0
* \ 
[Promises](http://ruby-concurrency.github.io/concurrent-ruby/1.1.0/Concurrent/Promises.html)
  are moved from `concurrent-ruby-edge` to `concurrent-ruby`
* Add support for TruffleRuby
  * (#734) Fix Array/Hash/Set construction broken on TruffleRuby
  * AtomicReference fixed
* CI stabilization
* remove sharp dependency edge -> core
* remove warnings
* documentation updates
* Exchanger is no longer documented as edge since it was already available in
  `concurrent-ruby`
* (#644) Fix Map#each and #each_pair not returning enumerator outside of MRI
* (#659) Edge promises fail during error handling
* (#741) Raise on recursive Delay#value call
* (#727) #717 fix global IO executor on JRuby
* (#740) Drop support for CRuby 1.9, JRuby 1.7, Rubinius.
* (#737) Move AtomicMarkableReference out of Edge
* (#708) Prefer platform specific memory barriers
* (#735) Fix wrong expected exception in channel spec assertion
* (#729) Allow executor option in `Promise#then`
* (#725) fix timeout check to use timeout_interval
* (#719) update engine detection
* (#660) Add specs for Promise#zip/Promise.zip ordering
* (#654) Promise.zip execution changes
* (#666) Add thread safe set implementation
* (#651) #699 #to_s, #inspect should not output negative object IDs.
* (#685) Avoid RSpec warnings about raise_error
* (#680) Avoid RSpec monkey patching, persist spec results locally, use RSpec
  v3.7.0
* (#665) Initialize the monitor for new subarrays on Rubinius
* (#661) Fix error handling in edge promises