chore(deps): bump concurrent-ruby from 1.3.6 to 1.3.7 in /mobile (#166)

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.3.6 to 1.3.7.
- [Release notes](https://github.com/ruby-concurrency/concurrent-ruby/releases)
- [Changelog](https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ruby-concurrency/concurrent-ruby/compare/v1.3.6...v1.3.7)

---
updated-dependencies:
- dependency-name: concurrent-ruby
  dependency-version: 1.3.7
  dependency-type: indirect
...

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mobile/Gemfile.lock

@@ -87,7 +87,7 @@ GEM
     colored2 (3.1.2)
     commander (4.6.0)
       highline (~> 2.0.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     csv (3.3.5)
     declarative (0.0.20)